![]() ![]() ![]() To prevent false alarms, that circle must be large enough so the normal movement of the boat, and the inaccuracies in setting up the circle, don't cause the anchor alarm to go off. Anchor watch systems work by creating a security zone around the boat, which is the electronic circle the boat is allowed to wander around in without tripping an alarm. The challenge lies in understanding the limitations of the different anchor watch systems and choosing which to use.Īlmost all anchor watch systems rely on the global positioning system (GPS), a revolutionary aid to navigation that is nonetheless prone to errors that must be compensated for when used to monitor the boat's position. Today, with just a few keystrokes, you can have an electronic box stand the middle watch, allowing a few hours of shut-eye. Thankfully the days of wooden boats and iron men are behind us. You escape below only to have your pencil tear a hole in the soaking-wet chart while triangulating the boat's position. It's a pitch-black, nasty night with rain blowing sideways, and your concern about your anchor dragging sends you topside again to shoot bearings through lightning on distant landmarks. ![]()
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