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Anchor Watch — set a circle, get pinged if you drag

Drop a swing-radius circle around where you set the anchor; get an alarm if the vessel leaves the circle.

Set Anchor Watch when the hook is on the bottom. theONE captures the anchor location and draws a swing-radius circle around it. If the vessel drifts outside that circle, the alarm goes off. While theONE is open on screen it sounds a loud two-tone alarm through the speaker — with the Silent switch on too — and buzzes, until you stop it. The phone's volume sets how loud: turn it up before you turn in. theONE also sends a notification, "Anchor dragging" and how far she is from where you set the anchor, and sends it again every 30 seconds until you stop the alarm — for ten minutes, and for as long after that as theONE is still watching — even with the screen off. Its title shows on a locked phone even when iOS hides notification previews. The notifications need notifications on for theONE: if they are off, or iOS is holding back theONE's banners, sounds or Time Sensitive alerts, the chip and the sheet say so in plain words, with a button to iOS Settings. The alarm then only shows, and sounds, on theONE's screen and will not wake you. You can still arm. With VoiceOver on, theONE also says it out loud the moment she leaves the circle — "Anchor dragging" and how far she is from the set point — wherever you are in theONE while it is open.

Steps

  1. Drop and arm

    Once the anchor is set and you have backed down on it, use the Anchor Watch chip on Mission Control. Its right-hand bubble arms straight away at your current fix; tapping the left-hand side opens the sheet, where the button reads 'Arm at current position' and you can set the radius first.

    There is no 'Set Here'.

    The chip sits at the top of Live Telemetry. Fold Live Telemetry up and the chip stays on Mission Control whenever the watch is armed or dragging, or theONE is offering to resume one that was disarmed when the app closed; only an idle watch with nothing to say folds away with the panel.

  2. Pick your radius

    When theONE knows both the depth and how much rode your windlass has out, it suggests the honest geometry: the horizontal distance from the anchor — the square root of rode squared minus the water column squared — plus your length overall, plus about 10 metres for GPS scatter. It shows you that arithmetic in words, and clamps the answer between 5 and 250 metres.

    WITHOUT BOTH NUMBERS IT FALLS BACK TO A FLAT 30 METRES, which is a guess and not your boat's. Set it by hand when that happens.

    Tighten it when you have neighbours; loosen it for a big tide swing.

    VoiceOver reads the Drift radius slider as the radius in your length unit — "45 feet" or "14 meters" — and a swipe up or down moves it 10 feet or 5 metres at a time, inside the same 5 to 250 metres.

  3. Stopping it

    There is no snooze and no long-press. Any of these stops the alarm — the sound, the buzzing and the notifications still to come: the stop bubble on the right of the chip, which clears the watch, or open the chip and choose:

    • CLEAR ANCHOR WATCH — you have weighed and are leaving.
    • RE-ANCHOR HERE — she dragged, you have reset, and this is the new spot. It is a separate button on purpose: re-anchoring is a decision, not a way to quiet an alarm.

    TWO THINGS TO KNOW. The watch does NOT survive the app being swiped away — force-quit it and the watch is disarmed; on relaunch theONE offers to resume, and re-arming needs a fresh GPS fix. And the drag alarm's notifications are time-sensitive, not critical: theONE asks for critical alerts when you arm, but uses them only once iOS reports them on, and Apple has not granted theONE the critical-alert entitlement yet. Time-sensitive breaks through a Focus such as Sleep or Do Not Disturb as long as that Focus allows Time Sensitive notifications, which it does unless you switched that off; the hardware Silent switch still mutes the notifications. theONE's own alarm sound plays through the Silent switch, but only while theONE is open on screen — with the phone locked or another app up, the notifications are the alarm. Leave the ringer on at anchor.

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