AvMap EK IV groundspeed slow?
I have been messing around with my AvMap EK IV in the car and have noticed the GS is about 5 mph slower than my speedometer and my garmin auto GPS... The garmin and speedometer match. any ideas as to why the avmap seems to be incorrect?
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Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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