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A compass is still probably better. You could attempt to isolate the compass from the motors.
But this depends greatly on the hexapod ability to turn without sideways movement.
A compass is still probably better. You could attempt to isolate the compass from the motors. There are ways to shield magnetic fields, but it isn't easy.
Another solution would be GPS... well I know you laugh at me now but I only have to suggest...
. Some camera on the ceiling
you can use the triangulation of 3 beaming stations installed in the corners of the room.
May I ask you a thing? Is it that necessary for your robot to steer... why don't you try y axis movement???