Fieldwatch is a free, open-source Android app that can help identify the devices around you, including what might be watching or following you: trackers, cameras, drones (it even decodes their Remote ID), body cams, and more. It can help identify almost 250 device types, and you can add your own. It listens to nearby Wi-Fi and Bluetooth signals and compares them to a built-in signature database. It only receives, never transmits. No account, no ads, no back end, and it works fully offline. What's new: Fieldwatch 1.1.22 adds GPS jamming and spoofing detection, using the receiver that's already in your phone. 🛰️ When your GPS suddenly changes, Fieldwatch lets you know right away: * A popup with details of the interference * A voice alert * A red diamond on your path where it happened * The details saved in your sit * An optional note on your TAK marker It needs a one-time calibration. Choose your sensitivity and you're set. For best performance, keep the phone in a dash holder, or on your chest rig when you're on foot. Also in this build: weak pairing floods stay quiet while you're driving, and a real flood can leave a note on your TAK marker until it ends. Easier setup: Live now shows a banner when Location is off, and Diagnostics opens with a "What to check" list that names the exact switch that's off. The only official release is on my GitHub, link in bio. Each release lists the APK hash and signing certificate so you can check your build. Coming next: a localization framework. I'm building a proper translation system for Fieldwatch, so translating the app will mean filling in a language file instead of forking the codebase and hand-editing text buried in the code. If you've offered to help translate, thank you, and please hold off for now. Once the framework lands, your work will be much easier and won't break with every update.

Looking for an inexpensive project phone? I picked up a Moto G, about $30, running Android 16 to test with Fieldwatch. Pulled the SIM, sideloaded Fieldwatch, and got it running. Thanks to @Radio_Russell for pointing me to this. If you’re on an iPhone, this makes a decent project phone for Fieldwatch, ham radio apps, or a number of other good Android apps. Android 10 or newer works. Android 11 is slightly better, because it can read Wi-Fi beacon contents. It just needs working Wi-Fi and Bluetooth. No SIM or cell service required.

Fieldwatch 1.1.16 is out! Fieldwatch listens for nearby Wi-Fi and Bluetooth signals and identifies the devices sending them, such as tracker tags, body cameras, drones and in-car Wi-Fi. It does this using a list of device signatures you can edit in the app. You can get an alert when a specific device type or address shows up, and you can record a session in one place or along a drive, then compare it with later visits. Fieldwatch can also spot devices that seem to be moving with you and build reports from everything it picked up. What’s New Trackers that stand out - DULT (Detecting Unwanted Location Trackers) is the industry spec Apple, Google, and tag makers use so accessories can advertise whether they're near their owner or separated. Fieldwatch now shows that on the live list as a quick visual. It's especially useful next to radios that look like they're moving with you: Separated vs Near owner is one more clue about whether that tag might be yours or someone else's. That covers Google Find Hub tags, newer Apple earbuds and other Find My accessories, Chipolo, Pebblebee, and other tags that speak the standard. Separated tags usually hold their MAC address longer before rotating, which makes them easier to follow across a sit. Drones and Remote ID - Remote ID works over BLE and Wi-Fi ASTM. Live status shows Undeclared, Ground, Airborne, Emergency, or RID failure. Reports → Path draws the advertised aircraft track as a dotted line, with the pilot as a person icon. Hits can still push to TAK/ATAK. Reports cleanup - Path plots MAC alerts and signature alerts as class icons (once, at the strongest hear). Debrief and Compare PDFs get the same track treatment. Named sits now hold up to 6,000 unique radios. Signature Catalog 88 - Flock Extra attention is tighter (real Flock poles, not every LiteOn/Ring radio). Penguin decode for Flock external batteries. Sit export CSV/JSON now lists matched signatures and Extra attention families. Same pocket tool: receive-only Wi-Fi and BLE, on the phone, no server, free and open source. github.com/OffGridPete/Field…