Hi,I'm flying from New Zealand to NZWD (Antartica) with the Howard 500. But the navigation instruments aren't working as they should the closer I get to the destination. For example: the heading indicator is set to 120 but according to the GPS my heading is 100. This is at 450nm from NZWD. I also can't use the AP for following the GPS flightplan as it deviates to much...Is this a known issue with pre fsx planes that they "can't handle" the new round earth model of FSX? Is there a way to correct this?thanks!Wanne.

Whoops... it turned out to be gyro drift