White Cloud Blue Sky for Watch

Adds aviation tools to your Apple Watch.

FLIGHT DATA
Uses your watch's sensors to display key data such as your direction/track, altitude, climb rate and ground speed.
Altitude includes AMSL (above mean sea level, calibrated using GPS), QNH (altitude according to QNH pressure reported from a nearby airport) and user altitude (set by zeroing at a given place/elevation). The Metrics page provides a compact, single-screen overview; go to the various other pages for detailed information. The Altitude page now includes ground level and AGL altitude (if terrain data has been loaded for your location).

NAVIGATION
Use the navigation page to search for known points of interest in your area, such as airports, gliderports, heliports or paragliding/hanggliding sites.
Filter by type to find what is relevant to you. Tap on a point of interest to navigate towards that site.
For commercial airports, the app shows airport details such as ICAO/IATA code, traffic type (VFR/IFR), radio frequencies in use and runways (orientation and physical length).

AIRSPACE
The Airspace page displays airspace surrounding your location.
The main view is a composite of all airspaces in map range.
For details, use the list view which shows a detailed list of nearby airspaces with their class, floor and ceiling.

MAP
The map page displays a topographic map of your area with hill-shading and color gradients for terrain. Map tiles are downloaded for offline use. Current coverage: Alps region. Other regions will be added over time.

WEATHER
The METAR page displays weather information from airports around your location.
It automatically selects the source which is closest to your location (most relevant to you). Other sources can be selected manually using a list of available stations.
Weather info includes wind speed and direction, air and dew point temperature, air pressure and cloud conditions.
The QNH/pressure data reported is used to calibrate the watch's barometer, allowing the app to display your QNH-based altitude.

DATA SOURCES
Data sources currently supported:
- Worldwide airport and airspace data via openaip.net
- Weather data (METARs) via aviationweather.gov
- Worldwide free flight database via paraglidingearth.com
- European free flight database via DHV.de.
- Terrain (elevation) data via viewfinder panoramas.org. Current coverage: parts of Europe.
Once you have downloaded points of interest, airspaces and terrain data, the app does not need internet access. All of its features work offline except for the METAR page which provides up-to-date weather reports on request.

USAGE
To switch between pages, swipe or tap a display field on the Metrics page; the latter will take you to the associated detail page. Double-tap any page to quickly return to the Metrics page. The Airspace page is now left of the main (Metrics) page, making it accessible with a single swipe.
To conserve your watch's battery and accommodate the watch use model, the app is designed to stay active when used and return to watch face when not used (wrist lowered, no interaction) for longer periods. This period (maximum time inactive) can be set in the app's settings. When the app is used again, it continues where it left off.

Settings allow you to switch between physical units for distance (km or mi), altitude (m or ft), speed (km/h or mph), climb rate (m/s or ft/min) and temperature (deg C or deg F).

This is a standalone watch app and doesn't require your iPhone to be nearby.

Intended use: this app is neither a replacement nor an alternative to aviation-grade flight instruments and official aeronautical charts.