AnchorOwl: Anchor Alarm

With Pro, your Apple Watch keeps the anchor watch alone, on its own GPS. No account, your position stays on the device, and the alarm stays on until you silence it.

With Pro, AnchorOwl runs the whole anchor watch on your Apple Watch alone: on the watch's own GPS, with the iPhone switched off or left ashore. Mark the anchor with one tap, and the watch sounds and vibrates when the boat leaves its swing circle or the position is lost.

NO ACCOUNT, YOUR POSITION STAYS ON THE DEVICE • No sign-up and no account. • Your position is compared with the anchor on the iPhone or the Apple Watch and never leaves it. • No map and no internet connection needed, only GPS.

AN ALARM THAT STAYS ON Once the alarm sounds it stays on until you silence it, even if the boat swings back inside the circle. An anchor that dragged and held again still needs a look.

ON YOUR WRIST • Without the iPhone (Pro): tap “Drop anchor here” on the watch, and it keeps the watch with its own GPS, sound and vibration. • With the iPhone nearby (free): the swing circle and the distance to the anchor on your wrist, a buzz when the anchor drags, and the alarm silenced or re-armed without reaching for the phone. • “Test alarm” on the watch lets you hear it before the night.

THE WATCH • “Drop anchor here” marks the spot. The alarm radius is your swing circle, from 10 to 300 meters. • Drag alarm: sounds when the boat has stayed outside the circle longer than a delay you choose — immediately, or after 10, 30 or 60 seconds. • GPS-loss alarm: sounds when there has been no usable position for 30 seconds up to 5 minutes. • Imprecise fixes are ignored. • Re-anchored, or let out more chain? “Move anchor to boat” and the radius slider adjust the running watch.

ON THE IPHONE • Keeps watching in the background, with the screen locked. • A loud, looping alarm with vibration and a notification — it plays even when the iPhone is set to silent. • A radar plot, north up: the anchor in the center, the alarm circle, the boat and its track. Distance and bearing to the anchor, GPS accuracy and the time left on the watch. Meters or feet.

FREE AND PRO Every alarm, every setting and the radar are free. A free watch runs for 30 minutes; five minutes before the end a notification reminds you, and one tap re-arms it with the same anchor and radius. AnchorOwl Pro watches all night without re-arming, runs the watch on the Apple Watch alone and removes the ads — monthly, yearly with a 3-day free trial, or once for good.

GOOD TO KNOW AnchorOwl is an additional alarm. It does not replace keeping watch on board or life-saving equipment. The watch uses GPS all night: keep the iPhone on a charger and leave the app open in the background — closing it stops the watch. On the Apple Watch, start the night with a full charge. How precise the position is depends on the device and where it is on board.