TRK
GPS DEMO
HDG
Location is blocked on this page, so the needle has nothing to point from.
Install Pocket ADF on this phone so it opens full screen and works offline in the cockpit.
Flies a simulated aircraft at 100 kt with a 250/15 wind, so you can try the instrument on the ground. Drag across the dial to turn.
Tap one to tune it.
Drop a beacon of your own at your present position, such as on a field with no NDB. It stays on this phone.
With RMI off, this is a rotatable-card ADF. The needle shows the beacon's relative bearing, and you set the card yourself with the HDG knob: turn it, or tap its left or right side for 1°. Set it to your DI heading and the needle head reads QDM.
With RMI on, the card follows the heading reference automatically, like an RMI.
IDENT switches the beacon audio (Morse ident and static) on and off, so you can identify the station and then silence it.
TEST swings the needle 90° clockwise. With no signal the needle parks at 090. A red GPS or HDG flag means that input is missing.
Training aid only. This is not a navigation instrument and must not be used as one.
Beacons come from the OurAirports database (downloaded November 2026). Some may since have been withdrawn, so check the UK AIP before relying on a beacon existing. Frequencies are to the nearest kHz; the receiver accepts ±1 kHz. Magnetic variation is from the WMM2025 model.
Audio: on iPhone, ident audio needs the ringer on unless your iOS supports playback mode. Plug into the intercom or use Bluetooth for headset audio.