Garmin · direct install

Install on your Garmin watch

Download the file for your watch model and copy it onto the watch over USB. No store account, no pairing step. The watch app runs on its own and also receives incidents pushed from the companion.

Descent Mk3i (43mm)

Dive computer watch

Download .prg

SHA-256
db27ad5c2c24bec90053a2baae48131e83057407547abc75b17b96f27fdce4cb

fenix 7X / tactix 7

Same hardware platform

Download .prg

SHA-256
27eeac4728175063ab5cb065b12d41f497571497abb317a1332656ad2f741881

Your model not listed? Email hello@bomb.doctor with your watch and a build can be added.

How to install

Step 1 — connect

Plug the watch into your computer with its charging/data cable. On Windows the watch appears as a drive. On macOS, modern Garmin watches use MTP — install OpenMTP (free) to browse the watch.

Step 2 — copy the file

Copy the downloaded .prg into the watch folder GARMIN/APPS. That is the only step — no renaming.

Step 3 — eject and open

Safely eject the watch and unplug it. Open the activity/app list on the watch — The Long Walk is there. The watch verifies the file on first launch, then moves it into internal storage (this is normal; the file leaves the visible folder).

Step 4 — set the cordon

Open the app menu on the watch and choose New Cordon to enter charge weight, fill, and casing — the rings compute on the watch. Or push incidents from the companion app over Garmin Connect. Sideloaded apps do not use the Connect IQ phone settings screen, so set everything on the watch or via the push.

Good to know

Updates are manual: when a new version is posted here, download it and copy it over the old one the same way.
To remove the app, use the Connect IQ app on your phone or Garmin Express — deleting the file from the folder is not enough.
Verify the download with the SHA-256 above if your OS lets you (shasum -a 256 <file> on macOS/Linux).
This is a planning and training aid built on published safety models. It does not replace official ordnance tables or a qualified technician's judgement.

The Long Walk · Bomb Doctor · Privacy