Running fix
Find your position with the running Fix. You’ll love it. It is not in the Day Skipper syllabus or the Yachtmaster but it is worth having a look at. At the very least it reminds you of the discipline of establishing an estimated position. At best it fixes your position. Think how impressive it would be when the GPS has gone on the blink and no one knows where you are, to tell the skipper, “Give me an hour and I will tell you where we are at the end of it.” You will need to be in sight of a charted mark on the shore for that time, of course.