The key to setting up an effective perimeter for an anchor alarm is to allow just enough space for the normal movement and motion of the boat, so as to not signal a false alarm. Today’s anchor alarms rely on GPS technology, and allow users to create a perimeter (usually a circle) around the vessel. In its most basic form, an anchor drag alarm does just what its name describes: it emits a signal, or an alarm, when a boat drifts outside of a designated security zone around the boat. The idea of an anchor watch has obviously evolved overtime, and to this day, is still put into practice on many larger ships and yachts-with the support of marine electronics, of course. Originally, the idea of an anchor watch was born among sailors to stand watch overnight, keeping an eye on the vessel at anchor and standing ready to alert the crew of any potential dangers. § All alarms are active in the background and even if you lock your iPhone.Ĭontinued use of GPS running in the background can dramatically decrease battery life.What is an Anchor Watch and/or KnowWake’s Anchor Alarm? § Optional alarm on low volume / silent mode § Optional alarm on low battery or other power supply issues § Ship dimensions in true-to-scale representation in the map § Individual shapes instead of a fix swing arc Well, with Anchor Alarm you've the ability to set your swing shape in advance as individually as specific for each situation! I'm convinced, with this App your anchor watch will be improved in many ways!įor sure you know the problem after you set the anchor successfully, you would like to set an Anchor Alarm for your anchor-watch, but later at night the wind shifts from East to West, and exactly in West there is a nasty shoal. Also in case of other problems like poor GPS accuracy or power supply drain. I would like to wake up even if I sleep like a log. The adjustable swing arc should assume every possible shape, as the maximum distance could be different to each direction.Ģ. I had two simple Requirements to a Anchor Alarm App:ġ.
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