posted on Mar, 20 2011 @ 09:21 AM
i'll dig my good one out of my pack and check, but
i was driving home yesterday, a straight shot almost due east for 150 miles,
basically east-central new mexico.
my speedo is broke, so i use mt relatively inexpensive gps.
speedometer, altimeter and compass were all acting up.
gps was acting like i was driving on a hilly, curvy road, almost like a rollar coaster.
don't know how this relates, but the compass was almost swaying from south to north and back and forth.
like i mentioned almost a perfect straight line down the interstate.
does anyone know how a gps compass works?
i'm assuming it's built in and not a satellite signal.