No matter how long you’ve used a GPS it never hurts to get a refresher course. And if you’ve never used one, here’s a good way to start. Now the BoatUS Foundation for Boating Safety and Clean Water and the United States Power Squadrons have developed a new online course, “How to Use GPS,” to help all of us get where we want to go safely. The course is clear and makes GPS seem easy; it also can be taken anywhere – your office, your home, on your boat – when it’s most convenient for you. You can stop and…