You need a heading sensor which should have come with the RADAR PC. Your GPS
will only give you heading while under way.

"none" wrote in message
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I am using the map76s as a spare gps for my nobeltec charting software on
my laptop BUT it doesn't 'seem' to be using nthe compass data exclusively.
When i turn the gps at a standstill the boat icon turns the same way but
the absolute value is way off...circa 30degrees. Normally when I am
moving the dynamic gps data keeps feeing me heading data but when i am
stopped the radar needs a heading to align the chart to the echos. [the
software is radarPC which is a chart with radar and gps data superimposed]

Is the a way to get the garmin to output that compass heading data or to
check and see if it actually is outputting but the software is not using
it?
thanks rick