http://www.stormcam.org/gps-nextar/

NEXTAR GPS is frozen?
It first froze over when the temperature dropped to -20F. I brought it inside and it started working. Now it powers up and freezes on the NEXTAR screen every time. I drained the power and reset, turned in off and then on, tried sweet talking to it. Any ideas?
Let it sit for a few hours and adjust to room temperature. I will assume you have moisture inside of the unit. The best fix for this would honestly.. no joke, put in in a sealed container than has dried rice inside of it. The rice will help draw the moisture out of the unit quicker. Most people allow it to sit over night ( several hours ) before testing it.
Best of Luck.
My Nextar GPS running Garmin