Within each content area, there are one or more tutorials. Each tutorial consists of lessons. Each lesson should be a page detailing the concept being taught, along with sample code. Lesson and page ...
The popular free-flight computers (e.g. XCtrack, XCSoar, LK8000, FlySkyhy, Oudie, Naviter) are built on the open-unless-excluded principle. They accept, from various sources, airspace defintions ...
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