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Three steps: download the app for your watch, install it over USB, then link the watch to your account.

1 · Download

Your watch model Download AltiFenix

2 · Install (USB)

1. Connect the watch over USB.
2. Copy the downloaded .prg file into GARMIN/APPS/.
   macOS: use OpenMTP (Finder won't do it reliably). Windows: File Explorer works.
3. Optional (beta): create an empty AltiFenix.TXT in GARMIN/APPS/LOGS/ to enable the diagnostic log.
4. Eject, then open AltiFenix from the watch's app list.

The .prg may disappear from APPS after the next connect – that's normal (the watch moved it internally).

Full details, screenshots, and troubleshooting: the user guide.

3 · Link your watch

On its first run the app shows a 6-character code (also under Settings ▸ Link Watch).

Enter the code →

Not a primary altimeter. Backup/awareness aid only – always jump a certified visual altimeter, an audible, and an AAD. See the Safety & Privacy page.