MARS APRS Tracker — Android

Marin Amateur Radio Society

Download the App
Version 1.25.5 (build 86) · 64.1 MB · August 30, 2026

Installing

  1. Tap Download the App above on your Android phone or tablet.
  2. When the download finishes, open it. Android will warn that the app is from an unknown source — tap More details, then Install anyway.
  3. Tap Open when the install completes.
  4. Allow location when asked. The first time you tap Share Location it will also ask for notification and battery permissions — grant both, or background location sharing will stop when the screen locks.

You will need the event password from the event coordinator the first time you open the app.

Already have the app? Just download and install over the top — your settings are kept.
iPhone or iPad instead? The app is distributed through TestFlight; see the User Guide.
SHA-256
579c331aeca97dc5fb11889f1628f9ed3e55e932a4b0458dcc87612cbaf5ef08

Watch App — Wear OS

Read and answer net messages from your wrist. Requires Wear OS 3.0 or later (Pixel Watch, Galaxy Watch4 and newer) and the phone app above.
Download the Watch App
Version 1.25.0 (build 68) · 2.9 MB · August 18, 2026
This one is not a tap-to-install. A Wear OS watch has no browser and no file manager, so the app cannot be downloaded on the watch itself — it has to be pushed across from your phone with the watch in developer mode. Allow about 15 minutes the first time. Downloading the file on the phone and tapping it will not work: the phone correctly refuses to install a watch app.

Installing on the watch

  1. On the phone, install Wear Installer 2 from the Play Store (free). This is the tool that does the transfer.
  2. On the watch, open Settings → System → About → Versions and tap Build number seven times. It will say developer mode is on.
  3. On the watch, go to Settings → Developer options and turn on ADB debugging and Wireless debugging (some watches call it Debug over Wi‑Fi). Leave that screen up — it shows the IP address, and on newer watches a pairing code, that the installer will ask for.
  4. Put the watch and the phone on the same Wi‑Fi network.
  5. On the phone, tap Download the Watch App above and let it save.
  6. Open Wear Installer 2, let it connect to the watch, choose the option to install a file you already have, and pick aprs-wear-1.25.0-68.apk from your Downloads. Follow its pairing prompts.
  7. On the watch, open APRS Map from the app list. Start the phone app too — the watch reaches the net through it.
Have a computer with adb installed? Steps 2–4 are the same, then adb connect <watch-ip>:5555 and adb install aprs-wear-1.25.0-68.apk.

The watch does not share your location — that stays the phone's job. It does messaging only: read, reply by voice or canned message, and hear new traffic announced.
SHA-256
2ceeddf2b5d282b890c0972685da7c9078b0286bd379b1ce35aac5447c0c7915