Marine users can find plenty of uses from the above list plus a few more.
- If someone falls overboard you can return and find him or her.
- In conjunction with a chart you can avoid shallow water.
- You can avoid submerged objects.
- You can know where you are without any landmarks.
- You can find the next buoy in the race or the trip home.
- You can see if your drifting.
- You can hook it to your fish finder.
- You can see true speed and distance over the ground.