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| Sahara Travel Forum Topics specific to North Africa and the Sahara down to the 17th parallel (excludes Morocco) |
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#1
10 Aug 2003
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Atlantic Route - Update
Right here (+ a small pdf):
http://www.sahara-overland.com/routes/atlantic.html Chris S ------------------ Author of Sahara Overland and the Adventure Motorcycling Handbook, among other things http://www.sahara-overland.com 
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#2
8 Sep 2003
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Regarding the .pdf "Guergarrat to NKT with GPS":
What datum was used for the grid references provided? As I understand it, there are hundreds of different datums (different ways to compensate for the world not really being round). The GPS receiver can be changed from datum to datum but usually defaults to the datum common in the country of origin (purchase). My reason for asking is that I believe a gps receiver set to a different datum to that used to set (and publish) the way-points will place you somewhere different. I assume the error can be large or small depending on which (wrong) datum is being used.
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#3
8 Sep 2003
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Most people would be using WGS84, if nothing else is specified. Most (probably all) GPS's use this for their basic Lat/Long co-ordinates. The many other systems available are mostly regional country grids.
------------------ ichapp.users.btopenworld.com
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