I have been using the UTM code from WHOI on an Uno to convert GPS latitude/longitude to UTM easting/northing. On an Uno, double and float are the same, so the easting and northing values are slightly different from the website. On a Due, double is 64 bits and the Arduino and website values are the same. latlon2xy is the doc with the Arduino code. Since I last looked at GPS, Mikal Hart has an updated GPS library that computes distanceBetween() and courseTo(). It might be worth pursuing.
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