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Keep your OSTC up-to-date with the latest firmware

hwOS - OSTC 4 (Version 1.5.1)


[1.5.1] with RTE 2.00

FIX: 1.5.0 could enter dive mode when ambient pressure reduced during flight

[1.5.0] with RTE 1.90

FIX: Optical port timeout fixed
FIX: firmware version in logbook data
FIX: battery information in logbook data
FIX: correct main version number logbook data
FIX: fix drawing of CCR bailout profile in internal logbook

[1.4.8] with RTE 1.80

FIX: Important stability updates
FIX: Language updates
FIX: Spurious spikes in recorded logbook
FIX: NDL was logged incorrectly

[1.4.7] with RTE 1.70

NEW: "Saturation" replaces "Current GF", shows percentage of resulting GF high in GF-deco mode
CHG: Replace mbar with hPa in surface mode and logbook
FIX: CNS logging had unexpected values in the first minute
FIX: Language updates
FIX: Show all dive modes in surface mode (And not only CCR and OC)
FIX: Lags with screen freeze in dive mode fixed
FIX: In rare cases the OSTC4 did not power down correctly for sleep mode
FIX: Average depth was slightly off
FIX: Sync max. Depth and Depth properly
CHG: Intensive code cleanup and review, change to free GCC compiler
NEW: Full code release:
FIX: highlight the menu underline correctly on selected state in dive mode
NEW: Option to Flip the screen
FIX: Several minor layout corrections in dive mode
NEW: New implementation for ceiling (identical to hwOS 2 code)

[1.3.5] with RTE 1.06

CHG: hardware support for newer models
CHG: battery percent display in surfacemode (Not voltage)
FIX: language updates

[1.3.0] with RTE 1.01

NEW: apnea mode
NEW: gauge mode (including deco stop display of deco system in background)
NEW: Average Depth and Timer in big font mode
NEW: compass bearing stored
NEW: extra-low cave brightness configuration and ultra-bright setting
NEW: extended button control and factory reset option via bluetooth
CHG: bluetooth active on system start
FIX: gas consumption calculation
CHG: small battery voltage display in surface mode

[1.2.6] with RTE 0.98

NEW: feet now everywhere in the displays during the dive
FIX: futureTTS was always calculating 5 minutes independently from settings
FIX: warnings for ppO2 max and ppO2 min
FIX: text corrections
FIX: button settings internal handling redone
FIX: Desaturation Time and NoFly Time didn't show days.


FIX: customview header text
CHG: overview added as optional on/off in dive menu


CHG: duration of dive is now total time minus all time close to surface
NEW: CCR with sensors has 10 minutes timeout instead of 2 minutes like in other modes
FIX: button reset on start-up after updating to firmware 1.1.8
NEW: added ascent and descent rate in (small) numbers
CHG: failsafe if computer is turned on during flight (880 mbar limit instead of 700 mbar)
NEW: most center custom views can be turned on and off during dive (new menu in dive mode)
FIX: temperature graph in logbook
NEW: button sensitivity overdrive with 105% and 110% now available
FIX: helium desaturion time in logbook entry


FIX: Hardware driver issues in 1.1.2
FIX: Logbook Temperature Graph core redone
NEW: Set Marker in Divemode
CHG: Surface Time calculation now based on internal clock
NEW: Battery Status will be to set to last know value after RTE update


FIX: Multiple Deco Gas Changes
FIX: Automatic Firmware Update after RTE update (for upcoming updates)
NEW: Individual Button Offset
CHG: Update of some hardware drivers
FIX: readLimits for external software


FIX: button sensitivity configuration via external software
FIX: settings warnings in surface screen
FIX: minor fixes in external software communication


NEW: Deco Planner gas consumption
NEW. Langue Français
FIX: 0x4C prompt for unknown commands
FIX: VPM ceiling
FIX: smaller fixes (bluetooth, text, fallback times)
NEW: command to distinguish standard and Bonex version
NEW: BONEX design
CHG: interface to OSTC Companion, OTSC Tools and others
FIX: custom view limits
NEW: compass calibration stored on reset (RTE)


NEW: compass damping
CHG: compass design


FIX: read settings command (for external software)
FIX: menu system for Deco1 and Sys2


FIX: dive start time in export to DivingLog, Subsurface and more (all dives)
FIX: deco / NDL status in logbook recording (new dives only)


FIX: brightness adjustments
FIX: temperature graph scaling in logbook
FIX: trimix gases text in logbook
CHG: lower limit set for no fly time
CHG: start of dive mode is now at one meter if computer is running
CHG: divetime less than one minute does not change no fly time and time since last dive
FIX: NDL calculation information after deco dive with GF algorithm
ADD: improved support for external communication with OSTC Companion

hwOS tech für OSTC 3 / OSTC 2 / OSTC 2 TR / OSTC cR / OSTC plus (v3.05)



MD5: 2fcfaa793b1bca51cb55f4e068bcd4a3

CHANGE: In the Tech version, max. ppO2 limits can now be adjusted up to 2.0 bar.
  Caution: know what you are doing! Recommended max settings are 1.4 bar for
  work gases and 1.6 bar for deco gases.
CHANGE: CCR mode diluent ppO2 versus setpoint check can be disabled now.
CHANGE: Fine tuning of the better gas cue behavior.
CHANGE: Improved smoothing of compass display.
NEW: Attention and warning thresholds for gas density put into the options
  table (adjustment via external software only, no mapping in OSTC menu
  as of now).
CHANGE: Renamed OC gas type 'normal' to 'work' (gas for the working phase of the
  dive). Along with this, it received a down-arrow symbol to depict it as
  a gas for use at depth, similar to the '=' symbol that was introduced some
  time ago to visually depict deco gases (imagine the horizontal lines as
  deco stops).

  EXAMPLE 1: Single gas dive:
  set gas to use as 'first' and all other gases to 'disabled'.

  EXAMPLE 2: Gas-change, extended no-stop dive:
  set gas to start with to 'first', all other gases to be used later in the dive
  to 'work' and the unused gases to 'disabled'.

  EXAMPLE 3: Deco-dive with one gas for descent & bottom phase, and deco gases:
  set bottom gas to 'first', deco gases to 'deco' and the unused to 'disabled'.

  EXAMPLE 4: Deco-dive with a deco gas used as travel gas on ascent, bottom, and deco gases:
  configure the deco gas twice: once as travel gas and once as deco dive. Set the
  same change depths for both instances and put the travel gas before the deco
  gas in the gas list (i.e: gas 1: travel, gas 2: work (bottom) gas, gases 3-5:
  deco gases). Set the travel gas to 'first', the bottom gas to 'work', and the
  deco gases to 'deco'. Take care to adjust the pressure available on the deco gas
  which is used for travel gas, too, to the amount of gas that is planned to remain
  after having drawn the travel portion from it!

CHANGE: When ppO2 is above normal threshold, but still inside the deco max threshold, and
  the dive has not yet progressed to doing the deco stops, the ppO2 warning has been
  degraded to an attention, i.e. associated messages appear in yellow now instead of
  red as before.
CHANGE: In the simulator, the +5 minutes function can now be triggered in succession without
  needing to reopen the options menu each time.
BUGFIX: Setting the change depth of the first gas to zero caused some unintended behavior.
  This is captured now. Anyhow, since firmware 3.2 it is required to set proper change
  depths for gases and diluents, including the ones set as 'first'!
CHANGE: The deco calculator now automatically picks the best gas suitable for the set bottom
  depth. If no suitable gas is found (i.e. configured), calculation will be aborted with
  an error message. By this change it is possible to calculate dives that use a travel
  gas (set as 'first') and a bottom gas (set as 'work'), as the deco calculator will now
  pick the proper bottom gas for calculating the bottom segment.
  Note: the deco calculator does not calculate the descent phase but actually spends all
  of the set bottom time at bottom depth. While this puts the deco calculation results
  on the safe side, beware that the needs on the travel gas will not show up in the gas
  needs calculation results.
CHANGE: OSTC TR: The timeouts for attentions and warnings in connection with discontinued
  reception of transmitter data have been relaxed a bit:
  - For up to 2 minutes without updating the last value received will be retained.
  - After 2 minutes without reception of any updates the pressure value will be marked
    as outdated.
  - After 4 minutes without reception of any updates a transmitter will be declared lost.
CHANGE: OSTC TR: pressure logging has been implemented. Logged pressure data can be retrieved
  by downloading the logbook data using external logbook software.
CHANGE: Descent speed in the simulator has been increased from 19 to 24 meters per minute.
  This speed is not configurable, nor the simulator's ascent speed of 9 meters/min!
CHANGE: In dive mode, the battery voltage will be shown when reaching 30%, and a warning will
  be issued when the percentage reaches 25% with 1.5 Volt batteries or 15% with LiIon
CHANGE: Added a hysteresis to the dive start / dive end depth threshold.
BUGFIX: Bugfix in none-helium compile variant.
NEW: Added an option "extended stops" (named "Gas Change/...before 1.Stop" in Deco Setup
  -> Deco Parameters -> more). If set to YES, a gas switch will be planned immediately
  on the change depth of the gas, even if a stop on that depth is not required by deco
  constraints. When set to NO, the gas switch will be planned to be done on the next
  regular deco stop.
  With extended stops enabled and a setting of "Gas Change (time):+0'" the switch will
  be planned with no actual halt at the change depth (i.e. "switch on the fly"). With
  change time set to > 0', a dedicated stop will be placed at the change depth for the
  given number of minutes. This gas change stop may not be needed by deco constraints,
  but it will influence the following deco stop depths and times as it introduces some
  added time at depth.
CHANGE: Complete rework of the alternative dive mode screen layout.
NEW: Included RX firmware update into tech version.
CHANGE: Reworked code for ascent and deco stops calculation. Does produce different results
  compared to the code used in 3.00.3! With this implementation of an GF-controlled
  deco schedule it becomes visible when deco stops disappear due to a high GF slope
  (difference between GF low and GF high) combined with a moderate depth of the first
  deco stop.
BUGFIX: When switching between GF and aGF, the depth of the first stop (determined by GF low)
  will be recalculated now.
NEW: New tissue graphics option (compile option as of now): shows absolute tissue pressures
  (N2 + He added) and saturation per tissue. In the saturation bargraphs, the green line
  marks GF low position, the yellow line GF high and the red one 100%.
BUGFIX: GF low can not be set higher than GF high any more as such a setting would produce
  an illogical deco schedule.
BUGFIX: In case the compass is not calibrated, the heading is now displayed as "---°"
  instead of ".00°".
BUGFIX: In the surface tissue graphics, tissues whose supersaturation exceed 100% are shown
  in red color now.
CHANGE: If any tissue is beyond 100%, no desaturation and no-fly times will be shown anymore.
BUGFIX: After use of the dive simulator and the deco calculator the interim tissue desaturation
  is catched up now.
NEW: Added support for display type 2.
CHANGE: The Deco Engine has been reworked to now run for up to 700 ms each second (configurable,
  800 ms may be feasible also), split into two compute chunks per second. This increases
  reactivity to buttons presses and compass display, while boosting deco calculation turn-
  around times significantly.
CHANGE: The simulator now uses the current ambient pressure as surface pressure instead of a fixed
  1.000 hPa as done before. So in mountain diving, when being at the dive site the simulator
  will show the same NDL times and deco schedules as will be shown in a real dive.
CHANGE: When exiting the surface menu, the return to the normal surface screen has been sped up
  and the display of the power-up logo screen is skipped now also.
CHANGE: When submerged, the unit will now proceed from surface mode display to dive mode display
  without intermediate display of the power-up logos.
NEW: A cue is given when it is time to go up to th next deco stop by highlighting the next stop
  data until ascent is done.
BUGFIX: When being shallower than the indicated stop depth, i.e. because the deco needs to be
  accelerated, the reduced ambient pressure is figured in into the deco calculations such
  that the displayed stop time, TTS and gas needs do immediately reflect the reduced depth.
BUGFIX: When set to imperial units, all depth will be shown in feet now not only in dive mode but
  also throughout the whole surface menus.
BUGFIX: When in a leap year, the 29th of February is now correctly handled when adjusting time and
  date on exactly that day.
BUGFIX: Bugfix: with the option 'always show ppO2' set, in CCR and pSCR mode a "Dil:x.xx" ppO2
  message was sometimes shown twice, once as an info and additionally as an attention or
  warning. This has been fixed now: in case of an active attention or warning the secondary
  info message gets suppressed.
BUGFIX:: the Simulator +5 min function had a punch-through effect on the real world last
  dive time (displayed surface interval).
BUGFIX: Tissue desaturation is now also computed while in surface and menu modes.

MD5: df044192093ca72cab8b6cf00121c706

BUGFIX: Some language corrections
BUGFIX: Battery display in internal logbook
BUGFIX: Compass issues fixed

MD5: c227ac834f57fd831b71378cecaf2a7f

CHANGE: Battery selection menu simplified
BUGFIX: Minor language and layout corrections


MD5: 51307831e6874c540ceaf8708ee73c0f

- GF low can not be set higher than GF high any more as such a setting would produce
  an illogical deco schedule.

- Moved positions of the GF values in the custom view such that 100/100 can be shown
  without numbers graphically overlapping.

- The resettable stop watch shown in the compass custom view now has both of its
  digits for the seconds shown as intended.

- As it will always be unknown how much power will exactly be available from a battery,
  the threshold for a battery low warning has been rised from 10% to 30%. When in dive
  mode, the display brightness will be set to ECO upon reaching this threshold, too, to
  conserve as much battery power as possible. Anyhow, when the battery warning comes on,
  it has to be expected that the OSTC may shut down without further notice at any time
  due to depleted battery. It is therefore strongly advised to not start a dive with a
  battery reading below 50%.

- The color-coding of the ppO2 shown in the custom view has been aligned with the color-
  coding used in the ppO2 warning and attention message.

- Fixed the erratic gas needs of 999 bar when current depth is shallower than the depth
  of the currently indicated stop.

- OSTC TR: in custom view 'measured pressure / SAC / needed pressure': if needed pressure is > 400 bar,
  display will show ">400" in warning color.

- Improved detection of charging-completed.

- Gases whose ppO2 at current depth is between ppO2 max "normal" and ppO2 max deco are now color-coded
  in yellow while not in deco yet (they were colored red before).

- Faster display response when changing deco-related parameters.

- Changed color coding of current GF (supersaturation) value:

  + GF factors enabled:
    - attention (yellow) if current GF value >= GF-high value
    - warning   (red   ) if current GF value >= 100%

  + none-GF mode:
    - attention (yellow) if current GF value >=  90%
    - warning   (red   ) if current GF value >= 100%

  => Resulting overall indications when violating a stop depth (in none-GF mode, 90% is used for GF_high):

  1) When shallower than indicated stop depth but still deeper than ceiling *):   Attention on stop depth        (yellow)

  2) When shallower than indicated stop depth and shallower than ceiling:         Warning   on stop depth        (red)
     As the current GF will be >= GF-high in this situation, additionally:        Attention on current GF factor (yellow)
                                                                                  Attention on depth             (yellow, blinking)

  3) When shallower than indicated stop depth and ceiling, and outside ZHL-model: Warning   on stop depth        (red)
                                                                                  Warning   on current GF factor (red)
                                                                                  Warning   on depth             (red, blinking)

     *) In GF mode, the ceiling depth is calculated at GF-high, in none-GF mode at 100% supersaturation.

- Updated calculation of ascent time:

  + When there is a ceiling but not yet a stop obligation (deco will vanish during ascent):

      ascent time = current depth / ascent speed                                    rounded up to next full minute

  + When in deco with indicated stops:

      ascent time =    (current depth - depth of last stop) / ascent speed          rounded up to next full minute
                    +  1 minute for each meter from depth of last stop to surface
                    +  sum of all stop times

  + when in deco with indicated stop(s) and shallower than the last stop:

      ascent time =    1 minute for each meter from current depth to surface
                    +  time of the pending stop(s)

- De-cluttered and ordered dive mode custom views by topics:

   1  average depth and stopwatch         - all modes
   2  compass                             - all modes
   3  ppO2 sensors                        - CCR & pSCR only
   4  sensor check                        - CCR  mode  only
   5  pSCR data                           - pSCR mode  only
   6  tank pressure and SAC rate          - OSTC TR    only
   7  gas needs for ascent                - deco modes only
   8  gas needs for return                - cave mode  only, not yet available
   9  deco plan                           - deco modes only
  10  ceiling, current GF and tissues     - deco modes only
  11  CNS values                          - deco modes only
  12  ppO2, END/EAD and CNS               - deco modes only
  13  GF factors                          - deco modes only
  14  clock, battery and surface pressure - all modes

                                            deco modes = OC, CCR and pSCR

- Eliminated a use of the GF-high parameter in none-GF mode.

- Improved rounding of first stop depth.

- Improved calculation of NDL time.

- Improved and streamlined calculation of CNS values at end of dive.

- Improved switch-over from being within NDL to being in deco, and vice-versa. A stop time of ".." minutes will be shown
  when there is already a ceiling obligation but deco calculation reveals that it will vanish during the ascent, given
  the ascent speed limit is obeyed.

- Fixed a bug in the calculation of the initial ascent.

- Made overall deco calculations once more a little bit faster.

- Stabilized timebase for blinking of setpoint display.

- Improved handling of the condition when a bailout plan can not be computed due to no breathable bailout gas available.

- Upfixed alternative divemode screen layout handling, fixed message suppression and automatic custom view switching in
  combination with alternative layout.

- Added an option for selecting if the max. depth or the average depth shall be shown in the main divemode screen.

- Improved stability of the timebases used for calculating the average depths.

- Removed erratic NDL outputs in gauge mode.

- Fixed display of resettable dive time when it exceeds 99 minutes, 59 seconds:
  + up to  99 mins, 59 sec display shows minutes:seconds
  + after 100 mins         display shows hours:minutes

- Improved energy saving by shutting down compass and accelerometer circuitry whenever compass is not shown.

- For those that like underwater navigation with compass: when the compass is shown, the temperature display will
  be replaced by a display of the resettable dive timer.

- When configuring a manually set gas while the dive ("gas 6"), it's display will be color-coded according to the
  set O2 ratio, the current depth and the ppO2 max thresholds, the latter automatically switching between normal
  and deco ppO2 max on dive condition. After adjustment of O2 and He ratios, the gas can be finally taken by
  selecting the "gas: xxx" item from the menu.

- The better gas cue is now also given when switching while the dive to the manually set gas ("gas 6"). As long as
  there is a regularly configured gas or diluent that fits for the current depth, a cue will be given towards this
  regular gas/diluent. This cue can be suppressed by setting the cued gas/dil as lost.

- The tissue graphics in dive mode now also displays the number of the leading tissue whenever the current gradient
  factor is > 0% or when in deco. (remaining todo: there is a light flicker in the output)

- Reworked the way the current firmware version and status (beta, release) is displayed, removed the "SP" notation.

- Known limitation: after 18 hours, 12 minutes and 16 seconds of dive time:
  + The average depths will show erroneous values.
  + The resettable dive time will wrap around to 0.

MD5: f00ba50eb1e4ff7927aa0ec16a640b0b

- Stable Version -
BUGFIX: "lost gas" was re-activated in rare cases
BUGFIX: Internal deco planner did not display results in imperial units
BUGFIX: CNS display was out of scale (much too high) for some cases in the logbook
BUGFIX: pSCR ppO2 fixed
CHANGE: Battery names in "New Battery" menu (OSTC Plus and OSTC 3 only)

MD5: ec864820ee576841a2805227d7b39a99

- Stable Version - SP1
BUGFIX: Re-enable Sensors after sleep in PSCR mode
BUGFIX: handle two deco gases configured to the same change depth
CHANGE: minor italian translation update
CHANGE: Sync safety stop countdown output with divetime

MD5: 2f97a168530d2c86a43bbe382dde92ad

- Stable Version -
NEW: On-the-fly Gas needs calculations for all active gases
NEW: Internal deco calculator shows deco plan and gas beeds for Bailout case
NEW: CNS now, CNS in xx minutes, CNS if bailout plan is used and CNS when surfaced (Including all deco stops) is shown
NEW: Bailout TTS is computed in CCR mode (optionally) with gas needs for all bailout gases and all deco stops
NEW: Warning if an isobaric counter diffusion occurs (also in internal planner)
NEW: Warning "X-ZHL16-X" if deco model is used beyond theoretical limits
NEW: Show "Deco Zone" if we are in deco and at least one tissue is off-gassing
CHANGE: Internal deco routines heavily optimised for speed and code size
CHANGE: Limit button sensitivity to 80%
BUGFIX: Auto-Gain for newer compass versions did not work (Which decreased accuracy of heading)
CHANGE: Make disabled gases darker in surface mode (Common issue for color-blind divers)
CHANGE: French and Italien language updates
NEW: Independent saturation/desaturation multipliers for GF and non-GF Deco modes
CHANGE: Non-updated values are shown in dark blue (e.g. after a gas change) until values are valid again
CHANGE: USB OSTC (OSTC 3 and OSTC cR) will enter USB mode from Menu only

MD5: fc46b26261869dc6694fe3978766308e

- Stable Version -
BUGFIX: Display of negative (°C) water temperatures
NEW: One dezimal for water temperatures below 10°C
BUGFIX: Battery handling in OSTC Plus hardware

MD5: 4d547332a9feceeb1a528fefbc9279ed

- Stable Version -
BUGFIX: O2 Sensor readings were not updated in fixed setpoint mode
CHANGE: Minor logbook layout fix
BUGFIX: "lost gas" showed current set of gases (Diluents in CC, OC in Bailout) for both "lost gas" menus
NEW: Show Compass calibration results in Compass menu
BUGFIX: Simulator in CC mode
BUGFIX: Changing the dive mode and starting the simulator (without leaving the menu first) caused false calculations in the simulator
BUGFIX: PSCR Mode "OC Gases" showed Diluents, not OC gases
BUGFIX: CCR Mode ("First Diluent") was chosen based on OC "First Gas" number
CHANGE: CCR Calibration gas range limited to O2% 21-25 and 95-100 to save button presses
NEW: Show a warning for each sensor if the sensor is end-of-life after calibration (Less then 8mV in Air at sea level)
CHANGE: Minor optimizations
BUGFIX: Lost Diluent now possible in CCR and PSCR mode
NEW: ppO2 blinks in sensor mode when min/max boundaries are hit
CHANGE: Show actual GF (Not relative) in custom views in dive mode
BUGFIX: Do not check ppO2 for disabled gases
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
BUGFIX: Impossible fixed-ppO2 (e.g. 1,6bar in 3m) used for tissue calculations
BUGFIX: Menu tree cleaned up (Exited to CCR menu from simulator settings)
BUGFIX: Do not show GF in divemode for non-GF deco mode
BUGFIX: Skip MOD Test for CCR in Sensor modes (OSTC cR and OSTC3 only)
CHANGE: Swap positions of ppO2(O2) and ppO2(Dil) in customview 10 on screen: "left = lean" and "right = rich"
BUGFIX: A wrong configured gas was suggested as "Better gas" on the configured depth even if this resulted in a ppO2 high or low condition
BUGFIX: O2 as diluent in CCR caused wrong calculations (Deco, EAD, END) in less then 6m depth
BUGFIX: Ignore "Toggle GF" Menu entry (in divemode) when using the non-GF deco mode
BUGFIX: Minor dive mode layout fixes in CCR Mode
CHANGE: Minor German language fixes
NEW: Warning for Diluent beeing out of safe ppO2 range in CCR modes
NEW: New Customview 9 in OSTC cR or OSTC3 shows mV readings after Sensor calibration
NEW: Third and fourth logbook page per dive showing Gaslist and Setpoints in standard font size
BUGFIX: several minor graphic issues in logbook fixed
BUGFIX: Rare button issues in OSTC Plus hardware
BUGFIX: Compass sensitivity for newer models
BUGFIX: PSCR mode showed bailout gaslist instead of diluent gaslist
BUGFIX: PSCR mode "Better Gas" showed bailout gases instead of diluents
NEW: More customviews in surface mode for PSCR mode
NEW: Last Dive customviews in surface mode with divetime, depth and interval
BUGFIX: Reset to MOD in Diluent Menu did reset Setpoint change depth
NEW: Two ppO2 max settings. One for travel/bottom and one for deco gases

MD5: 1644ab15225c01e2f2e772044f6221b5

- Stable Version -
NEW: Deep Sleep mode for OSTC Plus and OSTC 2 (2017) (Entered automatically)
NEW: Logbook detail page in larger font (And nicer layout)
CHANGE: Sleep mode current slightly reduced for all hwOS devices
NEW: Logbook now records battery information
NEW: Markers in internal logbook drawn as small "m" next to the profile

MD5: a1f5efe559530da84074ebf9b513046f

- Stable Version -
BUGFIX: Layout fixes in Gauge mode (German and French language only)

MD5: 426cb47b7e79b5b6da6a50e82693440b

- Stable Version -
CHANGE: Indicate "Bailout" for bailout deco plan in internal deco planer
CHANGE: Easier to understand "New Battery" menu (OSTC model dependent)
BUGFIX: Minor layout corrections in imperial units dive screen
NEW: New Customview 11 in dive mode shows ppO2, EAD/END and CNS
CHANGE: Customview 4 shows Clock, Battery Information and Tissue Information
CHANGE: Show warnings either in Customview (If active) _or_ next to warning sign
NEW: Show battery type in information menu (T0:3.6V AA, T1:1.5V AA, T2:3.6V/0.8A LiIon, T3:Internal 18650, T4:Internal 16650)
NEW: Show battery type in surface mode next to battery voltage


MD5: 00d22d2b2aff7dac331d40a278a7b496

- Stable Version -

NEW: Adjustable timeout for Divemode
CHANGE: Firmware now split in two variants (EN/DE) and (FR/IT)
NEW: New battery option for AA 3,7V rechargable (For OSTC 3)
NEW: Show Uptime (Time since last firmware boot) in information menu
NEW: Store more battery info into logbook memory
BUGFIX: Minor text alignment fixes



MD5: d4aa68d2c418852adbdb57a5538f500b


- Stable Version -

BUGFIX: Compatibility with hwOS Config fixed

NEW: New hardware descriptor command 0x60 added (For PC programs)



MD5: 1d8b13d8ed4ae52326a521471407532f


CHANGE: Logbook marker temporally disabled in internal logbook

BUGFIX: Characters with descenders were not drawn correctly in rare cases

NEW: Support for different compass chip (Internal hardware change)

CHANGE: Language fixes



MD5: 9b2f71a511890dad0e5624067354a6fb


Release version for new OSTC2 (Minor internal hardware changes)

CHANGE: Remove ppO2 [Dil] from OC dive mode screen



MD5: 8e73ae695057856502b42e431c571d2d


- Stable Version -

NEW: Support for new logbook memory chip (minor hardware change)

BUGFIX: Button sensitivity was not reset after update in some cases



- Beta Version -

NEW: New Customview shows ppO2(O2) and ppO2(Diluent) during CCR mode



MD5: 89e0bc9bd949588e3f1845efdd9dfe1c


- Stable Version -

BUGFIX: Fix missing ccr setup menu (From 2.02)



MD5: 234a56fb8b9add06a9c6344dfbfe2579


- Stable Version -

BUGFIX: Fix rare issue after battery change (OSTC3 did not start properly)



MD5: f7908ef65e0637a0d54de4f499b3b3db


- Stable Version -

BUGFIX: Divetime >99mins was not displayed (Only OSTC2 with serial > 10500)

BUGFIX: Minor layout fixes in divemode (Dynamic gaslist and stopwatch)

BUGFIX: Minor language updates



MD5: e01ad26895b65097605af33e95089211


- Stable Version -

NEW: Logbook marker can be set in dive mode menu (OC only)

NEW: Logbook shows markers with small orange boxes in the profile

NEW: Lost Gas feature allows disabling gases during the dive

CHANGE: Show velocity from 5m/min or more (Ascend or descent)

BUGFIX: Make sure SP1 is always selected on start in Auto-SP mode

CHANGE: New segmented speed graph in divemode

NEW: Safety Stop can be configured (Start-, End- and reset-depth + length of stop) via PC



MD5: a0ee9c3854b68916445cfe62144bd157


- Stable Version -

BUGFIX: minor text allignment in CCR mode

CHANGE: fix timing issues during Bluetooth download (Bluetooth models only)



MD5: c99ef3ef813aba656a67929aa785698b


- Stable Version -

CHANGE: Logbook now shows end-of-dive date and time for dives made with firmware <1.92 indicated by an icon in the logbook

CHANGE: Logbook shows start-of-dive date and time for dives made with firmware >=1.92

BUGFIX: Text alignment in logbook

NEW: Show actual dive count in logbook list view (If <1000)

BUGFIX: Minor language and text aligment fixes



MD5: 2eb16d81d1bc7087d7f8ef576118a7ef


- Stable Version -

BUGFIX: German texts in ppo2 menu were too long for screen resulting in resulting in text display issues

hwOS sport für OSTC sport / OSTC plus / OSTC 2 / OSTC 2 TR (v10.61)


MD5: c597bdb7fd2499d0e390e1aaedb0cbce
BUGFIX: Surface mode could freeze in some hardware versions
BUGFIX: Potential issue with Bluetooth in older OSTC sport models
CHANGE: Default language in EN/DE version is English again

MD5: ecc3920cfee8b21720e6131f126d0851
BUGFIX: Version number was not shown in main screen
BUGFIX: Button function could be toggled on charger

MD5: 52eefadd6bd7ef05032ab0f151100644
BUGFIX: NDL in big font display
BUGFIX: Bluetooth mode in old OSTC sport (Red buttons)

MD5: d1585f659a64c57f4dbf6a222277cbef
NEW: Five gases instead of three
NEW: Optional, 2nd Tissue graphic with markers for GF_low, GF_high and M-Value
NEW: Complete new Deco Planner and OSTC Simulator
NEW: 2nd Deco plan can calculate "Gas needs" (Optional) for all gases in real-time
NEW: Optional "Gas change time" and selectable extended stops (Shifting the gas change to the first real deco stop)
NEW: Configurable ascend speed
NEW: Support for more hardware versions (OSTC sport and 2 TR)
NEW: 2nd Layout (With larger fonts and slightly less information)
CHANGE: Deco plan is updated much faster
NEW: Information menu shows hardware version

MD5: 2e2d691b89479934d7d433bb4a2da7cb
BUGFIX: New battery menu was not visible after battery insertion on certain hardware versions


MD5: c8493b112d7686c5578b7f9479782ec0
NEW: Updates OSTC 2 TR computers to RX-Firmware 1.37
BUGFIX: Fix (another) critical issue with compass routine


MD5: a5fbee144b7ff14cc0053a7b6f3614a6
CHANGE: Battery selection menu simplified
BUGFIX: Minor language and layout corrections


MD5: d8a8f44d4465a114c96712cb78d49d0d
BUGFIX: Too high sleep mode current in OSTC 2 and OSTC plus fixed
NEW: Updates OSTC 2 TR computers to RX-Firmware 1.36
CHANGE: Faster rendering of fonts and logbook graphics
NEW: Show RX-firmware in custom view in surface mode
NEW: Option to log Apnea dives in the logbook
BUGFIX: Fix issue with compass routine
CHANGE: Use hPa instead of mbar for surface pressure


MD5: 945ec4a1ce0ce61cd795c75a865a2d1a
NEW: Updates OSTC 2 TR computers to RX-Firmware 1.32
NEW: Option to enable/disable the RX circuity (TR hardware only)
CHANGE: Default conservatism now 30/85 as in the hwOS TECH
BUGFIX: 10.45 showed "Update installed" after any power on reset
BUGFIX: In very rare cases, the gas setup screen could freeze in surface mode


MD5: 1421bdd102c8fbec5f909451aa36818e
CHANGE: Updates OSTC 2 TR computers to RX-Firmware 1.31
BUGFIX: One dezimal for water temperatures below 10°C
BUGFIX: St.By-Current for OSTC 2 TR computers was higher then expected
CHANGE: Minor language updates


MD5: b80fc8a6605729ef676d510b02c1edca
BUGFIX: Auto-Gain for newer compass versions did not work (Which decreased accuracy of heading)
CHANGE: Make disabled gases darker in surface mode (Common issue for color-blind divers)


MD5: a81cc91f2f67abbaf5754865719d8a25
NEW: Support for OSTC 2 TR hardware
NEW: Support for new compass electronics (internal hardware change)


MD5: d50c59e956ee954e7e298d16682a0ec8
BUGFIX: Display of negative (°C) water temperatures
NEW: One dezimal for water temperatures below 10°C
BUGFIX: Battery handling in OSTC Plus hardware
NEW: Count dives during Apnoe mode (Shown next to Total)
NEW: Second ppO2 setting for deco gases


MD5: 83d803a7cddebf737df8a40ae062eaa5
NEW: Show Compass calibration results in Compass menu
BUGFIX: Logbook-Offset display in menu


MD5: 5b9155f0a567e3f8c43360734904b20e
CHANGE: Show actual GF (Not relative) in dive mode
BUGFIX: Do not check ppO2 for disabled gases
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
NEW: Additional custom view in dive mode: ppO2, Ceiling and current GF
NEW: Last dive custom view with divetime, max. depth and interval
NEW: "Reboot" and "Reset Deco" option in Reset menu
BUGFIX: Minor language fixes in German and French


MD5: d510b0f6632d4402f73b154bb2b60b65
NEW: 2nd and 3rd logbook details page re-designed
BUGFIX: several minor graphic issues in logbook fixed
BUGFIX: Rare button issues in OSTC Plus hardware


MD5: f685aff34796f70eb167e87f7ae31934
BUGFIX: Decoplan with a lot of deco caused minor graphic errors in dive mode
Bugfix: More then one marker shown deleted profile
NEW: Show battery % in logbook (For dives made with 10.34 or newer)


MD5: 72f03dfdcd561152ebba8413229d0a64
NEW: Deep Sleep mode for OSTC Plus and OSTC 2 (2017) (Entered automatically)
NEW: Logbook detail page in larger font (And nicer layout)
CHANGE: Sleep mode current slightly reduced
NEW: Logbook now records battery information
NEW: Show time since last dive in surface mode
NEW: Markers in internal logbook drawn as small "m" next to the profile


MD5: 63e63b2292c4cc1387dd2c63f197aed0
NEW: Dive mode menu has option to manually quit the dive when in <1m depth
BUGFIX: Surface mode decoplaner did not show stop lengths on new OSTC plus
BUGFIX: Layout fixes in Apnea mode (Bottom line)


MD5: f93388ef748ec56ef5c5529e1fffd739
CHANGE: Simulator max depth now 70m
NEW: New Customview 5 in dive mode shows ppO2, EAD/MOD and CNS
CHANGE: Customview 3 shows Clock, Battery Information and Tissue Information
CHANGE: Show warnings either in Customview (If active) _or_ next to warning sign
NEW: Show battery type in information menu (T0:1.5V AA, T1:3.6V AA, T2:3.6V/0.8A LiIon, T3:Internal 18650, T4:Internal 16650)
NEW: Show battery type in surface mode next to battery voltage


MD5: 186edb0ae3bc27b1bb3e183e4310aba9
BUGFIX: Minor layout corrections in imperial units dive screen
BUGFIX: Battery menu and companion compatibilty for non-BLE Sports


MD5: 77c984d69de345aa617f0762e2ba71a1
BUGFIX: Compatibility with "hwOS Config" fixed
NEW: New hardware descriptor command 0x60 added (For PC programs)
NEW: Support for 0.8Ah rechargable battery (3,6V)
NEW: Refined battery meter code
NEW: Adjustable timeout for Divemode
CHANGE: Several language fixes
NEW: Show MOD in all Gas Setup related submenus
NEW: Show Uptime (Time since last firmware boot) in information menu
NEW: Store more battery info into logbook memory
CHANGE: Easier to understand "New Battery" menu



MD5: aa95cfa15dda0ce6d973897627d072c9

NEW: Support for new logbook memory chip (minor hardware change)

CHANGE: Large font for current gas in gas setup

NEW: Allow GF settings configured through PC



MD5: 4708bf61070576443f4f7fe65c57863a

BUGFIX: Fix missing gas setup (From 10.24)

NEW: Safety Stop can be enabled/disabled from the menu



MD5: f85b96e5406fac11def528768a6b7771

BUGFIX: Fix rare issue after battery change (OSTC sport did not start properly)



MD5: 609d722c9bb8599aa908b92ec15cb75a

CHANGE: Show velocity from 3m/min or more (Ascend or descent)

NEW: Segmented speed graph in divemode (optional)

NEW: Variable speed (7-20m/min) depending on depth (optional)

NEW: Safety Stop can be configured (Start-, End- and reset-depth + length of stop) via PC

NEW: Logbook marker can be set in dive mode menu

NEW: Logbook shows markers with small orange boxes in the profile



MD5: 83fa30f8ffdaf3c4c8d8f155291348b1

CHANGE: Logbook now shows end-of-dive date and time for dives made with firmware <10.22 indicated by an icon in the logbook

CHANGE: Logbook shows start-of-dive date and time for dives made with firmware >=10.22

BUGFIX: Text alignment in logbook

NEW: Show actual dive count in logbook list view (If <1000)

BUGFIX: Minor language and text aligment fixes



MD5: a730b736ce322aa216810c35e9ade9b9

CHANGE: button hold-down will increase values or move the cursor automatically (again)

BUGFIX: +5min for stopwatch during simulation did not work

BUGFIX: Bluetooth communications issues



MD5: 8e445d06ad5caf5fafe6f7b36ebe41c2

NEW: Option to rotate the screen

BUGFIX: BLE timings for MAC issues

BUGFIX: Battery consumption calculation in sleep mode (3,6V battery only)

NEW: Bearing can be set in surface mode



MD5: 3d212302a810f40097954ebac0f5929f

CHANGE: Custom GF high range increased to 45-95
NEW: Quit Simulator automatically when starting a real dive
BUGFIX: Auto-Brightness clipped to lowest settings in bright sunlight on some devices

MD5: 94f07a4d736cb2a1555a1faf127546b9

- Stable Version -
NEW: Deco planer computes gas consumption for all gases
CHANGE: Battery warning adjusted

MD5: 180a23d1a92b94e5da08e4c85bd42389

- Stable Version -
BUGFIX: Fix PC download issue for dives made with 10.16 firmware

MD5: f8101514a7e66dde8aae0a76fcd65c40

- Stable Version -
CHANGE: Range of Custom GF_lo now from 20 to 95
CHANGE: Automatically abort connection fail after 2mins
BUGFIX: Fast Gas change near the ppO2 limit could cause switching to a non-available Gas #0
BUGFIX: There was a 1:4096 chance that a portion of a dive was not stored correctly resulting in download issues

Firmware für OSTC 2C / OSTC 2N / OSTC mk.2 (v3.13)



New in 3.13:

Stable Release

NEW: Logbook shows markers with small orange boxes in the profile


New in 3.12:

Beta Release

BUGFIX: Minor layout fix (Battery warning in divemode)

CHANGE: Color-code battery display in surface mode (Charge, Full, Normal)

New in 3.11:
BUGFIX: First Diluent and SP Mode used same EEPROM location

New in 3.10:
Stable Release

New in 3.05:
Beta Release
NEW: Quit Simulator automatically when starting a real dive
CHANGE: Battery percent based on ON-Time instead of battery voltage

New in 3.04:
Beta Release
BUGFIX: Fix licence in German
BUGFIX: Fix minor layout bugs in surface mode
NEW: Auto Setpoint switch function (CC Modes)

New in 3.03:
Stable Release
BUGFIX: 1st line in logbook was not displayed in rare cases (2C hardware)

New in 3.02:
Stable Release
BUGFIX: Divetime had unwanted . behind the minutes

New in 3.01:
Stable Release
BUGFIX: Entry time in logbook when dive was around midnight
BUGFIX: Show manually set O2 (Gas 6) correctly
BUGFIX: Show dives with >999mins divetime correctly

New in 3.00:
Stable Release
BUGFIX: Fix color codes 192-223 (Mk.2 and 2N only)

New in 2.95:
BETA Version
BUGFIX: Surface interval was paused during simulator
BUGFIX: False Bailout and Gas 6 flags in logbook
BUGFIX: Color of Menu? in divemode

New in 2.94:
BETA Version
BUGFIX: False bailout flag in logbook
NEW: On-Time counter for better battery information
NEW: Store useage timer in logbook header (Byte 54, see documentation)
NEW: CF74: Battery Timeout [min] - Battery symbol will blink if the OSTC was
longer in active mode (since the last _full_ charge) then CF74.
Default=1800 (30hours)

New in 2.93:
BETA Version
NEW: Show Gas change countdown if CF55>0
CHANGE: Graphical velocity on by default (CF60=1)
NEW: Ceiling display (GF_hi based) in divemode
CHANGE: No turkish language support anymore
BUGFIX: Gas volume computation when using several travel mixes

New in 2.91:
BETA Version
New: Show bailout event in internal logbook

New in 2.90:
Stable Release
BUGFIX: CNS calculation in decoplan should track gas (no marked changes anymore)

New in 2.81:
BUGFIX: Show bailout list if first bailout gas <> gas 1
BUGFIX: Italian language fix (Divemode menu)
BUGFIX: Gas change depth display in divemode menu (OSTC 2C only)

New in 2.80:
Stable Release

New in 2.75:
BETA Version - Do NOT use for diving
BUGFIX: ppO2 display in PSCR Mode

New in 2.74:
BETA Version - Do NOT use for diving
BUGFIX: remove ghost image (On 2C only) during first second in sleep mode
CHANGE: Remove CF55 from decolist
TODO: show gas change stops different from decostops
BUGFIX: FTTS>9min in OSTC 2C hardware
NEW: Show the bailout list in surfacemode (CC Modes)
CHANGE: Faster button response

Firmware für DR5 (v2.10)


V 2.10 stable
CHG: High-low sensor voting
FIX: bailout menu in dive mode
FIX: USB mode file system access
NEW: USB mode watch dog
NEW: time and date menu after hard reset
NEW: fast boot to dive mode
CHG: return to CCR after Bailout dive
NEW: Calibrate info on surface screen

V 2.09 stable
FIX: custom view decolists

V 2.08 stable
NEW: up to 30 longer standby time

V 2.07 stable
FIX: O2 display of inactive sensors in surfmode
FIX: USB timeout
FIX: power consumption in standby after first start
FIX: menu colors in divemode
FIX: Gaslist selection on Bailout start in divemode
NEW: speed optimization level 2

V 2.06 stable
FIX: O2 and Scrubber display in dive mode
CHANGE: O2 calibration range extended
CHANGE: menu name for open circuit gas changes

V 2.05 stable
BUG: O2 sensors display not in seperate lines. Please use V2.02 for O2 monitioring prior to V2.06 release.

CHANGE: First Gas instead of Bottom Gas in menu
FIX: stop watch
FIX: end of dive

V 2.02 stable
CHANGE: start divemode exit counter if depth < 1.0 meter and

V 2.01 stable
FIX: stability with 1. generation motherboards
FIX: deco-info with 0 minutes did not disappear if TTS > 0 minutes

V 2.0 stable
NEW: VPM-B with GF
NEW: Bühlmann GF ( hw Version 3.0)
NEW: table mode

V 1.98 beta
DR5 redone.
CHANGE: new deco models
NEW: table mode
CHANGE: menu strucure surface
CHANGE: USB connectivity
CHANGE: menu structure dive
NEW: Future TTS
NEW: ceiling limit
NEW: brightness level 4
CHANGE: gas changes seperate for TRAVEL / DECO / BOTTOM
CHANGE: custom views in surface mode
CHANGE: logbook appearance
CHANGE: USB ends to standby
CHANGE: conservatism saturation / desaturation removed
CHANGE: decoplanner deactivated
CHANGE: no CCR in beta
CHANGE: snake deactived

Unpack to DR5 root directory . as some .system files will be changed for proper screen layout

V 1..60 stable
FIX: firmware old status
KNOWN ISSUES (20.June 2013): surface-decoplanner with fixed setpoints has faulty output

V 1..50 stable
FIX: battery status
FIX: snake below 30 mtr.

V 1.32 stable ( V1.30 build 1.32 )
FIX: gaschange warnings now based on ppO2 stop limits instead of ppO2 attention values

V 1.31 stable
CHANGE: custom I 'warnings' II 'core' back again in Dive Setup
CHANGE: depth without leading zero
CHANGE: ppO2 out of 0.2 to 1.60 range with 'STOP' warning sign

V 1.30 stable
FIX: UDDF 3.1 logbook
CHANGE: warn system during dive
known issues: battery charging - green LED @ 70

V 1.22 stable
FIX: Logbuchspeicherung
NEW: leicht veränderter black skin

V 1.20 stable (release 31.01.2012)
NEW: Deaktivierung und Reaktivierung von einzelnen Gaswechseln im Tauchmodus
NEW: individuelle An-/Abschaltung von defekten O2 Sensoren im Tauchmodus
NEW: Kalk/Scrubber Uhr

NEW: direct config via PC
NEW: UDDF 3.1 mit CCR und ppO2 Infos in der Logbuch Datei
NEW: Automatische Installation von Firmware Updates
NEW: intelligenter USB Modus

NEW: vorbereitet für digital I/O

NEW: black skin

FIX: Anzeigen im Tauchmodus
FIX: Seriennummer Auswertung

Firmware für frog (v1.21)



Latest frog firmware