Thanks for the input. I have reset the defaults 3 times, tried it with and without any cards at all. I have a total (guessing here, not counting actually) of perhaps 60 waypoints. I did not clear the NAV directory (not sure how to anyway but I could search it out) but did clear all tracks. I don't have anything else hooked to it; it is a stand alone unit.
I have ordered an external GPS (without heading sensor), hope to have it this week. Hopefully, the new external GPS will solve the issue.