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#11
May 30th 04, 12:05 AM
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Can a GPS with compass, heading & groundspeed capability be used legally
in lieu of a separate compass and airspeed instruments on an experimental homebuilt airplane? Or at least in lieu of the separate compass? You definitely need the airspeed!! Winds can make a GPS groundspeed pretty far off and useless for airspeed deductions that you'd really want on takeoff and landing. As for compass, that's got to be in the FARs somewhere, too, likely 91.xxx. On the other hand, given how good GPS course readouts are, I'd love it if ATC would let you fly an assigned course, not just an assigned heading. Ed Wischmeyer ATP/CFII 
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