This is a small library for converting between GPS coordinates in decimal form to a local coordinate structure per the AlvinXY algorithm as laid out in the paper below.
Murphy, Chris & Singh, Hanumant. (2010). Rectilinear coordinate frames for Deep sea navigation. 2010 IEEE/OES Autonomous Underwater Vehicles, AUV 2010. 1 - 10. 10.1109/AUV.2010.5779654.