# Anchor Alarm: GPS Boat Watch — Drag & drift alert for sailing > Drag & drift alert for sailing (iPhone/iPad app by Immaginet Srl.) - Source: https://appshunter.io/ios/app/anchor-alarm-gps-boat-watch/id6749796095 (this page in markdown: same URL + `.md`) - Developer: [Immaginet Srl](https://appshunter.io/developer/545184631) - Category: Navigation, Utilities - Price: Free - Age rating: 4+ - Requires: iOS 17.6 · 11 MB - Languages: American English, Croatian, Danish, Dutch, Finnish, French (France), German (Germany), Greek, Italian, Japanese and 6 more - Released: 2026-06-26 - Data updated: 2026-08-24 - User reviews in markdown: https://appshunter.io/ios/app/anchor-alarm-gps-boat-watch/id6749796095/reviews.md ## What is Anchor Alarm? Stop worrying every time you drop anchor. Anchor Alarm turns your iPhone into a professional boat anchor sentinel that never sleeps. When the wind picks up at 3 AM and your boat starts dragging, you get a critical alarm — even if your phone is silent, even if the app is closed. Real-time GPS marine watch monitoring for your vessel. Your boat. Your peace of mind. WHY BOATERS CHOOSE THIS FREE ANCHOR ALARM: ► NEVER MISS A DRIFT Real-time GPS monitoring with advanced Kalman filtering delivers meter-accurate position tracking for boat anchoring. The app continuously calculates your distance from the anchor and triggers an escalating alarm the moment you drift outside the safety zone. Visual warning. Audio siren. Vibration. Flash. We don't let you sleep through it. ► WORKS IN BACKGROUND — AND OFFLINE Grant "Always" location access and this anchor watch keeps monitoring while your screen is off, while you're using other apps, or when your boat has zero internet connectivity. The alarm sounds regardless. That's the whole point of a reliable marine safety app. ► FOUR ANCHOR ZONE TYPES • Circle — classic radius-based monitoring for any anchorage • Sector — wind-based swing monitoring for exposed bays • Polygon — custom shapes for irregular, rocky anchorages • Ellipse — tidal swing monitoring for areas with strong currents Pick the zone that matches your conditions. Auto-calibration adjusts the zone based on your initial swing pattern, giving you a smarter anchor watch experience. ► COMPLETE NAUTICAL CHART PLOTTER Built-in OpenSeaMap charts with seamark overlays for marine navigation. Explore harbors, marinas, lighthouses, buoys, and nautical POIs — all from live OpenStreetMap data. Toggle between anchor monitoring mode and free chart exploration. Plan your route. Scout your next anchorage. All in one app. ► SMART DRIFT PREDICTION Anchor Alarm doesn't just react — it warns you before the drift happens. Predictive algorithms combine real-time GPS data with weather conditions (wind speed, direction, barometric pressure) to estimate where your boat will drift next. Get ahead of the problem before it wakes you up. ► WEATHER AT A GLANCE Real-time weather from OpenMeteo integrated directly in your GPS anchor monitoring screen. Wind speed and direction, atmospheric pressure, and severe weather alerts — all at a glance. Essential for any sailor. ► POWER MANAGEMENT THAT MAKES SENSE Four power profiles to match your situation: • Maximum Precision — continuous GPS, highest accuracy • Balanced — adaptive sampling for overnight anchor monitoring • Battery Saver — reduced frequency for long passages • Critical Mode — minimal monitoring when battery is low Estimated runtime display so you know exactly how long you can monitor. ► APPLE WATCH COMPANION Anchor Alarm on your wrist. Real-time sync with your iPhone. Glanceable complications. Critical alerts even when your phone is in the cabin. Remote arm/disarm. Standalone emergency mode for when you're away from the helm. ► YOUR DATA, YOUR DEVICE All anchor session data stays on your iPhone. No cloud upload, no account required. Export your sessions as CSV, GPX, or JSON for logbook keeping. Full privacy. No marine data leaves your device. ► SUBSCRIPTION DETAILS Anchor Alarm is free to download and use with basic features. Premium unlocks unlimited anchors, advanced nautical charts, cloud sync, custom alarms, advanced marine analytics, and removes ads. Two plans available: • Monthly — €1.99/month • Annual — €9.99/year (save 58%) Payment charged to your Apple ID account. Subscription auto-renews unless canceled at least 24 hours before the current period ends. Manage and cancel anytime in your Apple ID settings. Privacy policy: https://privacypolicyhub.vercel.app/ancorasicura/en Terms of use: https://privacypolicyhub.vercel.app/ancorasicura/en Built for the sailing community, by sailors. ## Version history (last 3 releases) ### 2.1.0 — 2026-07-11 5 new languages: Danish, Norwegian, Finnish, Polish and Turkish — Anchor Alarm now speaks 16 languages. Location permission prompts localized in every language. Minor fixes and performance improvements. ### 2.0.1 — 2026-07-07 We rebuilt Anchor Alarm from the ground up for iOS 17. Nautical chart explorer with OpenSeaMap and real POIs from OpenStreetMap. Four anchor zone types (circle, sector, polygon, ellipse). Smart drift prediction. Four power profiles with battery runtime estimates. Apple Watch companion. Critical background alarms. Three languages. ### 2.0 — 2026-06-26 No release notes. ## Apps similar to Anchor Alarm | App | Rating | Price | Category | | --- | --- | --- | --- | | [Ankerwache Pro](https://appshunter.io/ios/app/ankerwache-pro/id6737927360) | — | Free | Navigation | | [Safety Anchor Alarm](https://appshunter.io/ios/app/safety-anchor-alarm/id6756064994) | 3.0 (2) | Free | Navigation | | [Virtual Anchor: Anchor Watch](https://appshunter.io/ios/app/virtual-anchor-anchor-watch/id6747093987) | — | Free | Navigation | | [DriftWatch](https://appshunter.io/ios/app/driftwatch/id1001235751) | — | Free | Navigation | | [Anchor Alarm Pro](https://appshunter.io/ios/app/anchor-alarm-pro/id6780215106) | 5.0 (1) | Free | Navigation | ## More apps by Immaginet Srl - [Paper - Block Notes, Draw, Paint, Sketch on your photo! Free](https://appshunter.io/ios/app/paper-block-notes-draw-paint-sketch-on-your-photo-free/id547050787) - [GPS Finder: Car and location tracking free](https://appshunter.io/ios/app/gps-finder-car-and-location-tracking-free/id859401429) - [Bitcoin.CZ - Bitcoin pool mining monitor](https://appshunter.io/ios/app/bitcoincz-bitcoin-pool-mining-monitor/id879074039) - [Walk - Pedometer Step Counter for running, jogging and training with widget](https://appshunter.io/ios/app/walk-pedometer-step-counter-for-running-jogging-and-training-with-widget/id889607407) - [dTector - Metal Detector AR](https://appshunter.io/ios/app/dtector-metal-detector-ar/id910643165) - [dTector PRO - Metal Detector and EMF level meter](https://appshunter.io/ios/app/dtector-pro-metal-detector-and-emf-level-meter/id932334225) All apps by Immaginet Srl: https://appshunter.io/developer/545184631 ## Related topics [ancor](https://appshunter.io/ios/topics/ancor) · [anchor watch](https://appshunter.io/ios/topics/anchor-watch) · [anchor alarm](https://appshunter.io/ios/topics/anchor-alarm) · [anchor watch live zenkou folwr](https://appshunter.io/ios/topics/anchor-watch-live-zenkou-folwr) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*