3 AM. Wind picking up.
You lie awake in the dark, listening to the rigging. Is the anchor holding — or are you slowly dragging toward the rocks?
Now taking Early Bird reservations
Sleep Tight.
We Keep Watch.
The first dedicated GPS anchor alarm. Precision GNSS. 72-hour battery. A loud siren in your cabin — not a phone app that crashes. From €199.
- 1–2 m multi-GNSS
- 72-hour battery
- IP67 waterproof
You know the feeling.
Anchoring is one of the best parts of cruising — and one of the most stressful. The fear that your anchor won't hold is real, and universal.
Your app crashed. Again.
The phone you trusted to watch the anchor silently quit in the background. The battery is at 4%. You have no idea if it ever alarmed.
Was that a scraping sound?
Or were you dreaming? You climb out of the bunk for the third time tonight to check the GPS. Nobody on board is really sleeping.
You're not alone. 70% of sailors sleep poorly at anchorage.
The alternative to an anchor alarm app
Your phone is not an anchor alarm.
A free app feels like enough — until the night it isn't. The same hardware that handles your calls, charts and weather can't also be a dependable, dedicated anchor drag alarm.
- GPS drift
- A phone's GPS wanders 5–15 meters even when perfectly still. That drift triggers false drag alarms all night — or masks a real one.
- Background killing
- iOS and Android shut down background apps without warning. The one night it matters, your anchor alarm simply isn't running.
- Battery drain
- Running GPS all night flattens your battery — and your phone is your lifeline for weather, comms and emergencies. It can't be both.
“I was woken up 4 times a night by false alarms. Or not at all, when the app crashed.”
30-second setup. 72-hour protection.
No pairing, no menus, no scope math at midnight. Three steps and you're protected.
- 01
Drop
Lower your anchor and press the big button on the AnchorKnight. It locks in your exact GPS position — one tap, with wet hands, in the dark.
- 02
Set
Choose your watch radius — 15, 25, 50 or 100 meters — with the dial or touchscreen, to match your swing room and scope.
- 03
Sleep
Take it to your cabin and set it on the nightstand. It watches your position every second. Drift too far and a loud siren wakes you instantly.
Specifications
One job. Engineered to do it perfectly.
Dedicated marine hardware — not a feature buried in a multifunction display. No phone required. Fully standalone.
- GPS accuracy
- 1–2 m
- Multi-GNSS: GPS + GLONASS + Galileo + BeiDou, 1 Hz update
- Battery life
- 72+ hrs
- Rechargeable via USB-C, continuous anchor watch
- Water resistance
- IP65 / IP67
- Rain, spray and salt air — built for the deck
- Alarm volume
- 85–90 dB
- Built-in siren + bright visual LED alarm
- Display
- 5″ IPS touch
- 720 × 1280, sunlight-readable touchscreen
- Connectivity
- WiFi 6 · BT 5.0
- Push notifications to your phone (optional)
- Size & weight
- 130×85×18 mm
- Compact, handheld, wet-hand friendly controls
- Standalone
- No phone
- Fully self-contained — the app is optional
What the AnchorKnight is not
- Not a chartplotter — it doesn't replace your navigation
- Not a fishfinder, radar or AIS
- Not a phone app pretending to be hardware — it is the hardware
- Not a toy — marine-grade, IP67, professional alarm
How the AnchorKnight compares
There's a gap between a flaky free app and a €1,500 chartplotter. We built for exactly that gap.
| Feature | Phone apps | AnchorKnight | Chartplotter |
|---|---|---|---|
| Price | €0–€6 | €199–€299 | €800–€5,000 |
| GPS accuracy | 5–15 m (phone) | 1–2 m (dedicated GNSS) | 1–3 m |
| Reliability | Low — app gets killed | High — standalone hardware | High |
| Battery life | Depends on phone | 72+ hrs dedicated | Needs ship's power |
| Alarm in the cabin | Phone speaker | 85–90 dB siren | Only at the helm |
| Ease of use | High | Very high — one button | Low — complex |
Swipe to see the full table →
What sailors are saying
Early feedback from our beta testers across the North Sea, the Channel and the Med.
“First night on the hook with the AnchorKnight, I actually slept through till sunrise. No phone, no false alarms — it just worked.”
“The siren is genuinely loud. We tested it in the cockpit and it woke my wife in the aft cabin. That's the whole point.”
“I've tried three anchor alarm apps. This is the first device I'd actually trust in a crowded anchorage with a building breeze.”
Watch the independent review (YouTube embed placeholder)
As seen in
- Zeilen Magazine
- Waterkampioen
- Zeilersforum.nl
- Pair.nl
Companion app · free
Optional. Not required. But handy.
The AnchorKnight protects you entirely on its own. When you want more, the free companion app adds a live view and remote alerts — without ever becoming a dependency.
- Live chart view
- See your boat, your anchor point and your watch radius on a live map.
- Push notifications
- Get alerted on your phone the moment you drag — even ashore for dinner.
- Position history
- Replay how your boat moved through the night and review your swing.
- Weather integration
- Early warning when the forecast calls for the wind to build overnight.
Choose your AnchorKnight
Reserve now and pay on delivery. No charge today.
Early Bird — first 100 orders
€149 · save €50 · only 38 left
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AnchorKnight Essential
The standalone anchor alarm. Everything you need to sleep tight.
€199one-time
- AnchorKnight device
- USB-C charging cable
- Quickstart guide
Most popular
AnchorKnight + App Bundle
Device plus one year of the premium companion app.
€249one-time
- Everything in Essential
- Premium companion app (1 year)
- Live chart, history & weather alerts
AnchorKnight Pro
For serious cruisers. Barometer, extended app, extra mount.
€299one-time
- Everything in App Bundle
- Built-in barometer
- Extended app features
- Extra deck mount
- 30-day returns
- 2-year warranty
- Free shipping in the EU
The dedicated GPS anchor alarm, explained
An anchor alarm is a simple idea with high stakes: it watches your boat's position while you're anchored and warns you the moment you start to drag. For decades the only real options were a free phone app or an expensive chartplotter. The AnchorKnight is a third option — a dedicated anchor alarm built to do one job reliably, all night, every night.
The difference comes down to the GPS. A phone-based anchor drag alarm inherits all of your phone's weaknesses: consumer GPS that drifts 5–15 meters, an operating system that quietly kills background apps, and a battery you can't afford to flatten overnight. The result is the worst of both worlds — false alarms that wreck your sleep, and silent failures that leave you unprotected when it matters most.
Why a standalone GPS anchor alarm beats an app
A standalone GPS anchor alarm solves these problems at the hardware level. The AnchorKnight carries its own multi-GNSS receiver — GPS, GLONASS, Galileo and BeiDou together — for 1–2 meter accuracy and a one-second update rate. Because it isn't fighting an operating system for background time, the anchor monitoring never stops. And with 72+ hours of battery, your phone stays free for weather, communication and emergencies.
Just as important is where the alarm sounds. A chartplotter's anchor watch only alerts at the helm, far from your bunk. A phone's speaker is easy to sleep through. The AnchorKnight puts an 85–90 dB siren on your nightstand and, if you want it, a push notification on your phone over WiFi or Bluetooth — so the anchor dragging alarm reaches you wherever you are.
Choosing the best anchor drag alarm for 2026
When you compare a boat anchor alarm device against the alternatives, look for three things: positioning accuracy, independence from your phone, and an alarm loud enough to wake you in the cabin. The AnchorKnight was designed around exactly those priorities — a reliable anchor alarm for a sailboat or motorboat that sets up in 30 seconds and then simply works.
Whether you anchor on sheltered inland water or in an exposed coastal bay, a dedicated anchor alarm hardware device gives you something no app can: confidence. If you've been searching for an anchor watch device with GPS — a real alternative to an anchor alarm app — this is it. To go deeper, read our complete guide to anchor alarms or browse the AnchorKnight blog.
Frequently asked questions
Everything you want to know about your dedicated anchor alarm.
Yes. The AnchorKnight is a fully standalone GPS anchor alarm. It has its own multi-GNSS receiver, its own 85–90 dB siren, and a 72-hour battery. Drop anchor, set your radius, and it watches your position on its own. The companion app is optional — it adds live charts and remote push notifications, but the device protects you whether your phone is on board or not.
The AnchorKnight uses a dedicated multi-GNSS receiver (GPS, GLONASS, Galileo and BeiDou) with 1–2 meter accuracy and a one-second update rate. That is dramatically more stable than a phone, whose GPS typically drifts 5–15 meters — the single biggest cause of false anchor-drag alarms.
72+ hours of continuous anchor watch on a single charge. It recharges over USB-C from any standard charger or your boat's 12V USB outlet, so you never have to wire it into ship's power like a chartplotter.
Yes. The AnchorKnight is rated IP65/IP67 — sealed against rain, spray, and salt air, and protected against temporary immersion. It is built for the marine environment, not the living room.
The built-in siren reaches 85–90 dB — loud enough to wake you from a deep sleep in the cabin, paired with a bright LED visual alarm. You can also receive a push notification on your phone over WiFi or Bluetooth at the same time.
Absolutely. The device is compact and handheld (~130 × 85 × 18 mm). Set your anchor watch, then take it to your cabin, your bunk, or your nightstand. If you have the companion app, you can even step ashore for dinner and still get an alarm on your phone if your boat starts to drag.
We are taking reservations now. Early Bird and pre-order customers will be the first to receive units, and you will get an exact ship date by email well before we charge you — you pay on delivery, not today.
Yes. Every AnchorKnight comes with a 30-day return window and a 2-year warranty. If it does not help you sleep better at anchorage, send it back for a full refund.
Both. The multi-GNSS receiver works anywhere you can anchor — sheltered inland lakes and rivers, coastal anchorages, and offshore. You simply choose a watch radius (15m, 25m, 50m or 100m) that suits your swing room.
The AnchorKnight continuously monitors signal quality. If satellite reception degrades or drops, it warns you immediately with a distinct alert rather than silently failing — so you always know whether you are protected. With four GNSS constellations, signal loss at anchor is rare.
Never lose sleep at anchorage again.
Join the waitlist to lock in your Early Bird price and be first in line when the AnchorKnight ships. You pay on delivery — nothing today.
Don't miss the Early Bird — only 38 of 100 left.