raspberry-sailor Utilities for Navigation and Sailing, in Java NMEA Parser and related utilities Tide Engine NMEA Multiplexer Deviation Tool (build your own deviation curve) Polar Smoother (elaborate your own polars) Sample implementations and much more, keep posted. Misc links http://www.lediouris.net/logisail/documents/calibration.session.html http://www.lediouris.net/RaspberryPI/_Articles/data.logging/datalogging.html https://github.com/OlivierLD/raspberry-coffee/blob/master/Papers/happy.navserver/HappyNavserver.md