My little garmin will draw a track on a map so I can look at it and tell where I have been before. This allows me to boat at night and in the fog. Several 4am mornings going to shore from the island when there was no visibility, foggy windshield, and rain in my race, the track showed me the way. I know that the map can be inaccurate, but the track is not.
I now bring it with me snowmobiling on the lake to identify islands and where I am.
Geocaching (
www.geocaching.com) is a great way to learn to use a GPS. Find hidden treasures anywhere in the world.
I got my money's worth.