UTM or GEO
I suggest to work with UTM, as long as the application has to deal with distances of less than 100 NM because the grid of UTM is rectangular so calculating distance or azimuth is straight-forward, while with spherical coordinates the algorithm for range or azimuth is complex.
If the application deals with larger distances - you must work with GEO
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David Erez
Ramat Hasharon, Israel
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