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.
VNCVTA ProjectionLamberts Conformal ConicTransverse Mercator Scale1 : 500 0001 : 250 000 Rhumb LinesCurved toward equatorStraight lines Great CirclesStraight linesCurved toward equator MeridiansStraight linesStraight lines