I have been getting some weird directions from my Garmin Gps since we have been in Canada and Alaska. Today it took me to the back woods and when I got turned around and found my way to a campground ...
You likely are not getting a good signal from enough satellites. Mountains, declination, obstructions, and direction you're facing are common interferences.
Your gps settings should include a zipcode setting, which will adjust for declination. Also look for your satellite info display. It will show the number and signal quality of birds you're connecting to.
In Alaska the angles to geosynchronous (think "equator") satellites are awfully close to the southern horizon.
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