I use a gps and a computer to record gps signals. Then some scripts to get things out of the log file.
Corsair 31 XTR 20070506 Sail training on Stora Värtan
Corsair 31 XTR 20070512 (first part of Lidingö runt) We shut down the logger because the boat battery was low, and there was very little wind.
Corsair 31 XTR 20070607 Corsair Baltic Raid