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Originally posted by Doc Holiday
reply to post by Aeons
You kinda ansered you own question there...your GPS compass in your car points to true north....
and your holding a mag north device...now you need to check your declination in that area...to see if it matchs..
the gps in your car is not magnetic...it is pointless to remove it....its satelite aligned to true north...
Originally posted by Aeons
reply to post by Blaine91555
Every compass that is wrong is pointing wrong the same way.
Sure - that's possible. But then, odds are that that is even more strange.
Originally posted by Phage
reply to post by Doc Holiday
the gps in your car is not magnetic...it is pointless to remove it....its satelite aligned to true north...
Not really. Most GPS units (including the Nuvi) don't have a compass of any sort and the satellites can't tell it what direction it's pointed.
If you aren't moving, a GPS doesn't know where north is. They calculate the direction of motion. If you are moving slowly slight differences in the position calcs (accuracy) will provide an incorrect heading.edit on 3/23/2011 by Phage because: (no reason given)