The doubling angle on the bow fix is a useful way to find your location when you only have one marker or feature to fix from. It’s less accurate than fixing your position with two points, and your knowledge of your speed, any currents and wind affects the accuracy of the exercise, but when you only have one point to fix from, it can help you get a reasonable measure of your position. It’s something you might use on a long crossing to help fix your position when passing shoals or markers. Take a bearing to a known feature or marker, and note the bearing and angle off your bow.…