Mark - here's a suggestion from my Hangar partner: Yes (has a Magellan), but newer than that one, sounds like he should download all his way points then reset to default settings. Memory may be full too or his tracks to big.
Mark wrote: I have a Magellan 315A ..... On the last few flights the Magellan has been acting up, freezing up, then regaining normal mode and just doing weird stuff.