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I have a list of GPS coordinates (they should be near the coast of Guinea) and I am not sure what format they are in. After I figure out the format they are in, I want to better understand the process I should use to decide on what projection to use. Note: I have zero information except for the approximate location.

As is: (1) 1000350 1259062 (2) 959409 1258527

Here is what I've tried: Assuming they were just in decimal degrees: (1) 10.0035 -12.59062 (2) 9.59409 -12.58527

Assuming they were in d mm ss and that all the formatting was accidentally removed and doing a conversion to decimal degrees (D + M/60 + S/3600 = DD) (1) 10.01388889 -13.00055556 (2) 10.09694444 -13.11305556

While both options seem to be close to what I think they should be, they still don't look quite right!

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    Do you have an approximate geographic area where these coordinates should be? – Mintx Nov 23 '15 at 19:11
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    Could be UTM X & Y, but without a geographic area, there's no way to know which zone. – Vince Nov 23 '15 at 19:13
  • They should be near the southern coast in Guinea. – user32636 Nov 23 '15 at 19:40
  • Why don't you plot the result you find (both as dec. deg and deg, min, sec) using a GIS software and see where they lie? this is just to confirm if you have the right kind of projection. – yanes Nov 23 '15 at 19:47
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    Try DDMM.mmmm. That's a common GPS format. – mkennedy Nov 23 '15 at 20:35

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