Primary GPS on the throttle side. Secondary GPS on the clutch side. If I'm not in rally mode, only use the primary which is wired into the bike for directions and XM.
BTW, if you need cheaters to see up close, use a stick-on bifocal lens on the bottom of your helmet faceshield. Works great. Search for 'stick-on bifocal' in Amazon and choose your strength. I place mine a little off-center so it isn't in my normal field of view. Tilt my head a bit to check the GPS and it is clear.
RR