GitHub - Addic7ed/Gauss: Web application that can be used for conversion of GPS coordinates from WGS84 to Gauss–Krüger projection and vice versa, with an accompanying map visualization.
Trying out the surprisingly useful GPS Coordinate Converter app : iPad Pilot News
Coordinates - GPS Formatter - Apps on Google Play
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c# - Convert from British coordinates to standard WGS84 nmea - Stack Overflow