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how does the compass function in a GPS?

 
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pevins
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Joined: 09/07/2003 09:12:59
Posts: 3
Location: Sweden

PostPosted: Sun Sep 14, 2003 8:04 am    Post subject: how does the compass function in a GPS? Reply with quote

I am considering purchasing an Etrex Venture (cheaper than a geko) here in Sweden. The product description claims it has a compass with accuracy +/- 2 degrees. As a geologist, this feature greatly interests me since I am measuring 100's of orientations daily. Now I know you're saying, "What a lazy ! Use a normal compass". The problem is that I am mapping over some iron deposits that make a conventional compass useless. I was hoping this "electronic compass" could overcome this problem. Any insight as to how the compass works in Etrex Venture. Is it any different than in the Silva GPS?
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DavidW
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Joined: 17/05/2003 02:26:21
Posts: 3747
Location: Bedfordshire, UK

PostPosted: Sun Sep 14, 2003 8:04 am    Post subject: how does the compass function in a GPS? Reply with quote

I'm not familiar with that particular Garmin model, but there's only two ways that compasses are possible on GPS.





The first is to use the GPS signals - which requires you to walk in a straight line. The GPS will then give the direction of movement as a bearing from true north.



The other way, which some units including some more up-market Garmins have, is to include a magnetic flux gate compass in the GPS receiver. This works whilst stationary. However, I suspect this will be just as affected by the iron deposits as an ordinary magnetic compass.







David
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