# Glossary

- **AAT**: Assigned Area Task (competition task type with area turnpoints).
- **AGL**: height Above Ground Level.
- **Aircraft preset**: a read-only, built-in catalogue entry for an aircraft type (polar, masses, wingspans, handicap). Not a device config.
- **Aircraft profile**: a specific user aircraft (registration, callsign) created from a preset or from scratch, with per-field overrides. Only one active at a time.
- **BLE**: Bluetooth Low Energy.
- **Client**: a frontend connected to the core (local Tauri webview, browser, or secondary client on another phone/tablet). Never a connected instrument.
- **CUP**: SeeYou waypoint/task file format.
- **Device**: a connected instrument (GPS, vario, FLARM). Never a phone/tablet running the app, which is a client.
- **Emergency mode**: the navigation-target mode that shows up to three suitable landables and highlights the one currently selected.
- **FLARM**: collision-warning system ubiquitous in European gliding.
- **FL (Flight Level)**: pressure altitude in hundreds of feet referenced to 1013.25 hPa.
- **Flight View**: the primary in-flight UI containing the map, Situation Bar, infoboxes, and flight controls.
- **Focused target**: the one active navigation target that currently drives guidance, calculations, and target-dependent infoboxes.
- **IGC file**: FAI-standardized flight log format.
- **Infobox**: a configurable cell that shows flight information or provides a small, focused control. Its content is not limited to navigation.
- **MacCready**: speed-to-fly theory parameter (expected climb rate).
- **Map inspector**: the UI opened by tapping the map to inspect a selected position and any nearby objects.
- **Main Menu**: the full-screen root for screens outside the Flight View, opened by the Flight View's Menu control.
- **NMEA**: serial sentence protocol used by GPS and avionics devices, extended by vendors with proprietary `$P...` sentences.
- **OGN**: Open Glider Network, crowd-sourced ground-station network for glider position tracking via FLARM.
- **OpenAir**: de-facto standard airspace text format.
- **PMTiles**: single-file, HTTP-range-readable tile archive format.
- **Pinned target**: a navigation target kept visible in a compact readout below the Situation Bar whenever it is not focused.
- **QNE**: standard pressure reference (1013.25 hPa). basis for flight levels.
- **QNH**: local sea-level pressure setting. makes the altimeter read altitude AMSL.
- **Reach polygon**: area reachable in glide from current position, terrain-aware.
- **Screen**: a full-screen destination opened from Main Menu, such as Devices or Flight Review.
- **Situation Bar**: the fixed Flight View region that normally shows the focused target and is temporarily replaced by the highest-priority warning.
- **SPP**: Bluetooth Serial Port Profile (classic Bluetooth serial).
