Are straight lines great circles on the VNC or VTA?
Straight lines are GREAT CIRCLE TRACKS on the VNC, not the VTA. Don't forget to add or subtract magnetic variation from your straight line track on the VNC. [...]
What is Dead Reckoning
Dead Reckoning is the act of navigating based only on calculations of distance, track, true airspeed, and forecast wind information. You use these calculations to find your en route time, [...]