Gps

Log examples

NMEA

https://rodhern.wordpress.com/2013/03/24/gps-data-logger-log-files-nmea-0183/

Calculations

Great circle distance

https://software.intel.com/en-us/blogs/2012/11/30/calculating-a-bearing-between-points-in-location-aware-apps https://gist.github.com/caipivara/992c2f35d04a42a99ea5