Do i need a compass?

[BobTurner]

why cant you taxi on a specific gps heading, accounting for magnetic deviation, and swing your compass like that? really seems more accurate than trying to lign up your airframe up on a compass rose.

It’s just not the official way. There is a small issue that you do need to taxi some distance in a straight line to give the gps a chance to figure out the ground track. And then be able to stop and park for a bit while you twiddle the adjustment screws. IMHO this should work okay.