Great circle navigation.
-Calculate distance and heading along the great circle between two positions.
-Put in speed and get the time to travel.
-Use GPS for start position or own input.
-Compass.
-GPS speed and GPS course.
-Calculate distance and heading along the great circle between two positions.
-Put in speed and get the time to travel.
-Use GPS for start position or own input.
-Compass.
-GPS speed and GPS course.
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