I am thinking that the GPS indicates "Track", not heading. Brooke On Nov 24, 2012, at 5:47 PM, John Dibble wrote: > My IPad (Hilton software) displays a heading that is 4 degrees less than my panel mount GPS. My old moving map GPS (Lowrance) always agreed with the panel mount GPS. What headings do other IPad users see relative to the panel GPS? > > John >