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.

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.

ILS / GPS GP (advisory only): the ILS softkey picks the approach at the active airport. AUTO prefers the most headwind from the METAR (cached offline), otherwise the runway best aligned with your GPS track. ILS and LOC use published localiser course, glideslope angle and antenna positions (FAA NASR for the US, public domain; elsewhere Robin A. Peel nav.dat 2013.10, GPL v2, so it may be out of date). They show green. Runways with no published ILS get a magenta GPS GP: a 3.0° geometric path crossing the threshold at 50 ft (OurAirports runway data), never labelled ILS. Needles are computed from phone GPS position and GPS altitude, not from a radio receiver. LOC full scale is the ±350 ft course width at the threshold (1–3°); GS/GP full scale (2 dots) is ±0.7°, and "ON GS/GP" shows within ±0.12°. The display arms inside 15 NM and ±35° of the course, captures within 12 NM and ±3°, and shows the vertical needle inside 10 NM. Never use for an actual approach.

Wind on the DI: surface wind at the active airport from its latest METAR (filled arrow on the compass rim, at the bearing the wind is coming from, pointing in toward the centre). A dashed arrow shows the TAF forecast wind. Directions are °TRUE, speeds in knots. Weather refreshes every 10 minutes while online, and the last report is kept for offline use with its age shown. Data from NOAA via metars.eu (fallback datamask.org). Not for operational briefing; always get an official weather brief.

This page isn't on HTTPS, so iOS will block motion and location. Open it over HTTPS (see the README).

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.

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.