Jake,

See attachment for a sailing track uploaded to a PC using Chartview Planner software. On my Garmin 12, I have a choice of collecting data points for tracks by an automatic method (that uses resolution - i.e. logging points at a specified distance), or by defined time intervals. I usually set it to a specified time interval so that when I upload my tracks I can get a sense for speed by looking at the distance between data points. (Note in the upper right corner of the image that I still had the GPS on while I drove back to my house.)