Select start and destination point and you will see your flight route on a map.
A red line indicates that the Sun is shining on the left side (barboard) of the aircraft, a green line indicates that the Sun is on the right side (starboard). If the line is magenta the Sun is below the horizon and the Moon is on the left hand side, a cyan colored line indicates that the Moon is on the right hand side. If neither Sun nor Moon are visible, the line will be blue. Yellow and green arrows indicate the direction of sunrise, sunset, moonrise and moonset.
AstroFlight uses OpenStreepMap, which is capable to cache files for offline use. You can also load offline maps in the osmdroid folder of your SD card and share your offline maps with other apps using the OsmDroid library!