Suunto Nautic — updated priorities and feature requests

[Hugues78fr]

Hello,
Following my earlier post and recent forum discussions, here is my updated list of priorities. Thank you for the improvements already delivered.
Some points are feature requests; others concern reported behaviour that needs investigation or confirmation of a fix.

P1 — High priority

1. Ascent-rate detection and alarms
   Refine ascent-rate detection to reduce false warnings caused by brief wrist/arm movements, particularly when raising an arm to vent a drysuit, while retaining prompt detection of a genuine rapid ascent.

2. Desaturation and surface-interval continuity after power-off
   Investigate reports that tissue desaturation may not fully account for time spent completely powered off.
   Please verify that tissue loading, CNS/OTU tracking and surface intervals correctly reflect elapsed time after shutdown and restart. Publish the findings and identify any affected or corrected firmware versions.
   This is a request for verification, not a claim that a general algorithm defect has been confirmed.

3. Screen customization and essential information
   Provide much greater flexibility in configurable fields and layouts, including:
   Compass + Tank Pressure + Depth + TTS displayed simultaneously;
   a half-screen compass widget;
   clear access to the active breathing gas and decompression ceiling;
   greater freedom to select and position essential information.
   Keep the active gas and available tank-pressure readings visible during alarms and decompression, including below 30 bar, without requiring the diver to change pages to recover that information.

4. Compass bearing persistence and multiple bearings
   A manually selected bearing should remain active until the diver explicitly clears or changes it, including through power-save mode, screen changes and the transition from surface to dive mode.
   Allow at least two stored bearings, for example an active heading and a separately chosen return heading.

5. Technical diving — executable Runtime / Dive Plan
   Extend the existing planner so a dive plan can be prepared beforehand, saved and followed underwater, including:
   planned depth/time segments and descent/ascent rates;
   decompression stops and planned gas switches;
   cumulative runtime and planned versus actual progress.
   Keep the original plan available alongside updated predictions, so the diver can clearly distinguish the plan from the current calculations.

P2 — Medium priority

6. Numerical ascent rate
   Provide a configurable numerical ascent-rate display in m/min or ft/min, alongside the graphical indicator.

7. Gas Time alarm reliability and behaviour
   Some users report that the unwanted Gas Time alarms have stopped after updating. Please confirm the fix and the firmware versions concerned.
   Ensure reliable behaviour at dive start and after Tank POD signal loss or reconnection. Distinguish unavailable or insufficient data from a valid low-gas-time estimate, while keeping genuine low-pressure warnings clear.
   Provide clearer control over optional Gas Time notifications and their presentation.

8. SAC / RMV and gas-consumption analysis
   Build on the documented calculation method by improving:
   handling of missing pressure samples and signal interruptions;
   calculation stability after reconnection;
   consistency between live values, dive summaries and exported data;
   analysis by cylinder and selected dive segment.
   Clearly distinguish missing data from zero consumption, and make the averaging behaviour understandable to the diver.

9. Dive app, detailed logs and open integration
   Provide substantially better dive analysis within Suunto App or a dedicated dive application, together with documented, maintained access for third-party software such as Subsurface and libdivecomputer.
   Existing exports and community integration work are welcome. The goal should be reliable access to all recorded dive data, including depth/time, tank pressures, confirmed gas switches, ceiling, TTS, GF values, CNS/OTU and tissue information where recorded.
   Also support proper dive numbering, editing and comparison of records from a primary and backup computer without counting them as separate dives.

10. Dive-site plans available underwater
    Allow a photo or image of a dive-site plan to be transferred from Suunto App to the Nautic over Bluetooth without an Internet connection, then viewed offline during the dive.
    Include zoom, association with a site/POI and, optionally, compass orientation after the user defines north on the image.
    The practical use case is simple: photograph the briefing sketch on the boat, transfer it before entering the water, and consult it underwater. Essential dive information and alarms should remain accessible.

11. Entry/exit positioning and route transparency
    Improve the reliability of surface entry and exit positions.
    Clearly distinguish measured surface GPS positions from the estimated underwater route, and show the validity and age of the available position fix. Make the limitations of underwater route estimation explicit.

P3 — Additional planning improvements

12. Tides for a selected dive site
    Allow tide information to be selected by dive site or POI, with multi-day forecasts stored offline and the data source/reference station clearly identified.
    Where tidal-current information is available, distinguish it from tide-height predictions.
    Could the Suunto dive team indicate which items are already resolved, under investigation or planned? For completed fixes, the relevant firmware version would help users verify the result and avoid duplicate reports.