Nautilus

Nautilus -- Apnea & Breath-Hold Training Turn your Garmin into a dry-land breath-hold trainer. Record apnea cycles with live heart rate and best-effort pulse oximetry, follow CO2/O2 tables, or track a max hold. Save a FIT activity that syncs to Garmin Connect. FEATURES - Configurable countdown, vibration cues, progress ring and round indicator - Live HR and available SpO2, hold statistics, session totals and comparison with the previous hold - Four training modes: Basic, CO2 table, O2 table and Max hold - Optional hold alerts, rest-ending warning, target cue and automatic end at target - Plan pages preview every round's hold and rest, including final recovery - Resume, Save or confirmed Discard; pausing preserves the current phase - Garmin Connect SpO2 timeline, round laps, hold duration, minimum SpO2, longest hold and totals - Optional tones, silent training and display wake at phase changes - On-device settings and a built-in Controls guide CONTROLS Five-button watches: START/STOP begins or pauses; BACK/LAP ends a hold or starts the next hold during rest; UP/DOWN browse pages; hold UP for settings. Touchscreens: tap the lower third for the BACK/LAP action, tap the top of the ready screen for settings, swipe up/down for pages and swipe right to pause. On two-button touch watches, the top button is START and the bottom is BACK/LAP. On vivoactive 3, the button starts/pauses, a lower-screen tap ends the hold and holding the screen opens the menu. Edge uses START and LAP keys; touch Edges page with a left/right swipe. Find the same guide in Settings / Controls or by pressing DOWN on the ready screen. TRAINING MODES Basic: fixed countdown and rest, with unlimited rounds or a chosen round count and optional hold target. CO2: hold time stays constant while rest gets shorter. O2: hold target increases while rest stays fixed. Max hold: one round; BACK/LAP ends the hold and opens the save menu. SETTINGS Adjust countdown, rest, rounds, hold targets, table steps, hold/rest alerts, vibration, tones, pulse oximetry and display wake. BACK/LAP during rest can start the next hold immediately or run its countdown. After saving, START begins a new session. COMPATIBILITY The app builds for 143 Garmin product targets running Connect IQ 3.0+: Descent Mk1/Mk2/Mk2i/Mk2S/Mk3/Mk3i/G1/G2, fenix 5 and newer, Chronos, epix, quatix, tactix, Forerunner, Instinct 2/3, Venu, vivoactive 3 and newer, Enduro, MARQ, D2, Approach, Edge and compatible handhelds. Don't see your device under Compatible Devices? Garmin sells paid apps only to some devices. The free companion, Nautilus for classic devices, covers devices missing from this paid listing and runs the same app. Submitted for Garmin approval; installation will be available after approval: https://apps.garmin.com/apps/f3f6abe7-7b56-46eb-b97a-5401c07689e2 Pulse ox needs Connect IQ 3.2 and a pulse-ox sensor. Unsupported devices show SpO2 as N/A. Garmin firmware controls reading availability and cadence; the app cannot force continuous measurement. Edge and handhelds need a paired heart-rate sensor and have no vibration motor; enable Tones for audible cues where supported. Devices without a speaker ignore Tones. G1 and Instinct layouts keep text clear of the circular display inset. SAFETY Dry training only. Train seated or lying down and do not train alone. Never use this app for in-water apnea. Wet apnea risks shallow-water blackout and requires a trained, attentive buddy at arm's length. Permissions: Sensor, Fit and FitContributor.

## Version 1.3.0 -- Every Connect IQ 3.0+ device, Edge fix - 143 product targets (was 75): fenix 5 / 5 Plus / Chronos / 6 / 6 Pro, Forerunner 55 / 245 / 645 / 745 / 935 / 945, vivoactive 3 / 4, Venu / Venu Sq, Legacy Hero and Saga, Instinct 2 / 2S / 2X / Crossover, Enduro, MARQ (Gen 1), D2 Charlie / Delta / Air, Approach S62, Edge 520 Plus / 530 / 820 / 830 / 1030 / Explore, GPSMAP 66 / 67 / 86, Montana / Oregon / Rino 7 series - Minimum Connect IQ API level lowered to 3.0 - Fixed: starting a session crashed on Edge computers and handhelds, which have no vibration motor; cues are now skipped there, and tones are skipped on watches without a speaker (Venu, vivoactive) - One-button watches (vivoactive 3): hints and the controls guide describe the button, lower-screen tap, hold-screen menu and swipes - Touch Edges: page hints say "Swipe left/right" - The store only sells paid apps to some devices; a free companion listing, *Nautilus for classic devices*, has been submitted for the rest and is awaiting Garmin approval ## Version 1.2.0 -- Descent support, controls and small screens - Added Descent Mk1 and G1/G1 Solar support, covering all seven Descent product targets and their supported variants - Fixed startup on Mk1; pulse-ox features adapt to the watch's capabilities - G1 screens now avoid the circular inset and show round progress inside it - Restored once-per-second pulse-ox polling; invalid readings and paused callbacks no longer affect hold statistics - Missing oxygen readings no longer reuse a previous lap's minimum - Fixed a right swipe immediately after BACK/LAP being mistaken for another button press - Browse every planned round across numbered pages, including the final recovery interval - Rest screens show the next hold target and correctly label the final-session action - Improved text fitting and settings-save error feedback - Fixed the BACK/LAP button on the fenix 7 and other touch-screen watches: it now ends the hold instead of opening the pause menu; a right swipe still opens the pause menu safely - BACK/LAP during rest skips the remaining rest and starts the next hold immediately (setting: Skip rest = Hold now / Countdown) - New options: hold alert every N seconds, rest-ending alert, end hold at target, Basic rounds and Basic hold target - On-watch settings rebuilt: value lists focused on the current choice, real toggles, mode descriptions, rows filtered by mode - Controls guide: shown once on first run, in Settings / Controls, and on the ready screen (press DOWN); hints name your watch's own buttons - Plan page previews every round's hold and rest before you start - Layout now measures every string against the round-display width, adds a progress ring and page dots, and fits 166 px Instinct and 240 px fenix 7S screens - START after saving starts a new session; wake display now applies to every phase change and alert