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Navigation - Maps, Compass, GPS How to find your way - traditional map, compass and road signs, or GPS and more
Photo by Hendi Kaf, in Cambodia

I haven't been everywhere...
but it's on my list!


Photo by Hendi Kaf,
in Cambodia




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  #1  
Old 31 Oct 2007
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Join Date: Feb 2006
Location: Wimborne - Dorset
Posts: 83
Expert GPS software...

Has anyone any experience of using this package? I've downloaded it and have some scanned maps that I've used with it, but I seem to be getting a discrepancy in co-ordinates.

As far as I can see the software is set up properly, with WGS84 as the correct datum and the scanned maps have been calibrated with my Garmin MapSource maps, but if I prepare identical routes with both packages, the Expert GPS route is offset in the same way that it would be if the datums (data?) were different...

Any help apreciated

Greg
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  #2  
Old 31 Oct 2007
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possible solution

Maybe you've made the same mistake I did, allthough it was with regards to Google Earth as compared to my GPS coords.

Check if the coords are listed as Degrees:Minutes,Seconds or Degrees:Minutes, decimal minutes.

For instance: 56 08'11.52" N 10 11'44.39" E (Degrees, minutes, seconds)

can also be written as 56 08.859' N 10 11.741' E (Degrees, Decimal minutes)

As you can see, the coords resemble each other quite a bit at first glance. But taking a closer look you will detect the discrepancy that you have also noticed.

I hope it helped.
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  #3  
Old 31 Oct 2007
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Thanks for the reply McThor.

I guess I should have looked more closely at my stuff. Expert GPS suggests that you choose calibration points as far separated from each other as possible. This I did, using three corners of the map, however, doing that with a map that's slipped in the scanner produces.... offset results!

I re-calibrated my scan with known points on the route and bingo, everything lines up properly!
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  #4  
Old 31 Oct 2007
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Ahh...I see.

Well, glad you got it sorted anyway.
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