AH&DI
DIS---
DTK---°
TRK---°
ETE--:--
DIRECT TO

DCT flies a direct leg from where you are now. Or enter an inbound course in °TRUE (e.g. 275) to fly a fixed line into the airport, like an OBS course.

SETUP
PHONE MOUNTING
HORIZON SMOOTHING
CDI FULL SCALE (2 DOTS)
LEVEL CALIBRATION

USER WAYPOINTS

    AH And DI App v. Not an approved instrument — situational awareness only. Courses are TRUE. Speed is GPS ground speed; height is GPS altitude, not barometric.

    BEFORE YOU FLY
    1. Install it. In Safari tap Share → Add to Home Screen, then launch AH & DI from your Home Screen for a full-screen cockpit.
    2. Allow motion. Tap Enable sensors below. When iOS asks to access Motion & Orientation, tap Allow. iOS may ask again each time the app starts — tap Tap to start AHRS when you see it.
    3. Allow location with Precise ON. Choose Allow While Using App and make sure the Precise switch on the iOS prompt is on. Position, ground track, GS, GPS altitude, vertical speed, the CDI and the distance all come from the iPhone's GPS. With Precise off iOS only gives a position to within a few kilometres, so the CDI and distance would be wrong.
    4. Mount and level. Fix the phone upright in a panel/yoke mount, screen facing you (or choose Flat in Setup). In level flight press LEVEL.
    Denied a permission by mistake?

    Motion: close the app fully and reopen it. If it still won't ask, go to Settings → Apps → Safari → Advanced → Website Data, delete this site, then reopen. (On older iOS: Settings → Safari → Motion & Orientation Access.)

    Location / Precise Location: Settings → Privacy & Security → Location Services → turn on, then Safari Websites → While Using the App and switch Precise Location on. Then close and reopen AH & DI.

    Not certified for navigation. Phone attitude is gravity-referenced and can read wings-level in a sustained coordinated turn. Always fly by your aircraft's primary instruments.