ReefMap: Marine Navigation
Offline charts, GPS & anchor
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Your waters, fully offline — OpenSeaMap charts, GPS, anchor alarm and Man Overboard. Every safety tool free forever. Try Pro free for 2 weeks with the annual plan.
ReefMap is offline-first marine navigation for boaters, fishers, divers, and reef explorers. Download your waters once and navigate with no signal — nautical charts, GPS, and the safety tools you actually need — free forever.
WORKS OFFLINE
Save an OpenStreetMap and OpenSeaMap region for use miles offshore — charts, your GPS position, waypoints, tracks, and routes. No cell signal required. Satellite imagery and Ocean relief require internet and are not included in offline downloads.
CHARTS & POSITION
• Satellite imagery from Esri as the default view (requires internet), or switch to the OpenStreetMap chart
• OpenSeaMap nautical seamarks layered on top, with an opacity slider
• Optional Ocean relief (NASA): satellite-derived land imagery and shaded seafloor relief from August 2004 for regional overviews. Requires internet; limited detail, without depth queries or detailed reef and fishing layers
• Live GPS position, speed over ground, and course
• Coordinates always on screen — DMS, decimal degrees, or UTM; tap to copy
• Full-screen digital compass with true and magnetic heading
PLAN & NAVIGATE
• Drop waypoints with marine icons and categories — reefs, wrecks, anchorages, fishing marks, harbors
• Record GPS tracks and replay your route home
• Build multi-leg routes, or draw one on the chart with your finger, and follow it with live cross-track error and arrival alerts
• Trip computer: SOG, COG, VMG, trip distance and time, plus a barometric-pressure trend for weather awareness
• Tide predictions for US waters — highs, lows, and the current level from the nearest NOAA station
SAFETY — ALWAYS FREE
• Anchor alarm — set a swing radius and get alerted if you drag, even with the screen off
• Man Overboard (MOB) — one tap drops a mark and switches to bearing-and-distance back to the spot
• Night mode — a red-light helm palette that protects your night vision
• Keep-screen-awake while you navigate
YOUR DATA, YOUR DEVICE
• Export waypoints and tracks as GPX
• Everything is stored on your device
• Built for iPhone and iPad
FREE CORE, OPTIONAL PRO
Most chart apps cost $50–$150 every year. In ReefMap every safety tool is free forever — anchor alarm, Man Overboard, night mode, GPS, compass, waypoints, tracks and routes — and your first offline region is free too. ReefMap Pro is an optional upgrade that adds unlimited offline map downloads plus anchor-watch history and named anchorages. Choose Annual ($19.99 a year, with a 2-week free trial for new subscribers), Monthly ($3.99 a month), or a one-time Lifetime purchase ($49.99). Subscriptions renew until cancelled; manage or cancel anytime in your Apple Account settings. Lifetime covers every Pro feature that runs on your device, forever; future live data, such as worldwide tides and weather, will need a subscription. It's built on free public marine data (OpenStreetMap, OpenSeaMap), so there are no recurring chart-license fees to pass on to you.
ON THE WAY
Tides outside US waters, depth contours, reef-health overlays, and live weather are in development. The safety core always stays free.
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ReefMap is intended as a navigation aid only. It should not be used as a primary means of navigation. Always carry and use official nautical charts and maintain a proper lookout. Map data is derived from public sources and may be incomplete or inaccurate.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://reefmap.stevcodes.com/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Stevhen ., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Stevhen .
- Size
- 27 MB
- Category
- Navigation
- Compatibility
Requires iOS 17.2 or later.
- iPhone
Requires iOS 17.2 or later. - iPad
Requires iPadOS 17.2 or later. - Mac
Requires macOS 14.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.1 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Lifetime $49.99
- Pro Monthly $3.99
- Pro Annual $19.99
- Copyright
- © 2026 Reefmap