GPS watches are nice in the fact that they are easy to keep track of trips and you don't have to worry about dropping a handheld GPS. They come with a GPS receiver which you can put around your arm. It sends signals to the GPS watch. GPS watches, depending on the model, can tell you information from current speed, average speed, distance, maximum speed, and much more. It is great to have them on a walk, a hike, skiing, or even driving or flying. They don't have all the features of a handheld GPS but still can be a very valuable aid.