If you want to follow a constant true track value:

Question

Question ATPL - Airline Transport Pilot license - General Navigation

QuizVDS · Accepted Answer

You must fly a rhumb line.

QuizVDS · Answer

You, in most cases, will also fly the shortest possible track.

QuizVDS · Answer

You must fly a great circle.

QuizVDS · Answer

You must fly East / West or North / South.

Id 36 - ATPL - If you want to follow a constant true track value: