Rainbow's End Anchoring

An anchor watch, a watch from ashore, and mooring balls. The anchor watch. Mark the drop and Rainbow's End draws a fence from tonight's plan: the swing circle when you lie to one anchor, the corridor between two for a Bahamian moor, a tight ring for a boat held by a quay or by lines ashore. If the boat leaves the fence, the alarm sounds. The Watch tab shows the night live on a north-up plot: the fence true to shape, the boat as a moving dot, and the trail of everywhere she has ranged. The alarm waits for several fixes clearly outside the fence, so one wandering fix at three in the morning does not cry wolf. Keep the phone plugged in with the app open; if the GPS goes quiet, the screen says so. The watch from ashore. Leave a device aboard on watch and any other device on your Apple ID can follow it, through your own iCloud, with an alarm if she breaks out or goes silent. Or share the watch with crew by an eight-character code: anyone with the code follows the boat in the free companion app, Rainbow's End Monitor, and its arrow points them back to her from the dinghy dock. Both are opt-in, and nothing is readable by anyone without your Apple ID or your code. Mooring balls. A fifth way of lying, for the BVI and everywhere else you pick up a ball: the swing from the riser and pennant, the pennant length for your bow height, and a fence sized for a ball. Also: the info button beside each figure explains the doctrine behind it, lengths follow your chosen unit everywhere, deletes ask twice, and every label was read again for plain American sailing English. Location is used only for the watch, on your device, and leaves it only when you switch sharing on. If you never arm the watch, the app never asks for it.