OpenSeaMap

OpenSeaMap

The open nautical chart

1 ratings
43 reviews
$0.99 Free
In-App Purchases

Price history


Details

  • Released
  • Updated
  • January 25, 2012
  • April 27, 2026
OpenSeaMap screenshot #1 for iPhone
OpenSeaMap screenshot #2 for iPhone
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OpenSeaMap screenshot #7 for iPhone
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About

This app provides a free, worldwide nautical chart with detailed sea information, including lights, weather data, and harbor details. It offers chartplotting, waypoint management, and offline map caching for navigation. Users can mark locations, enter coordinates, and adjust chart zoom for optimal viewing.

Free worldwide sea chart
Chartplotting with tracking
Waypoint creation and export
Offline map caching
Mark and search locations
Adjustable chart zoom
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What's New in OpenSeaMap

4.4

April 27, 2026

- NEW: Fixed issue on launch of the app - NEW: Updated the user interface to use the latest OS

1

In-App Purchases

$1.99

OpenSeaMap Professional

All features marked as PRO will be activated in Version 2.x of the App.

User reviews

Can’t create a route, App crashes

First time user - I was looking forward to simply plotting a route over a marine chart, to visualize the likely vessel path before a recent South Korea marine accident. I’m usually quite adept at making apps work for me, including several other marine apps, but I couldn’t find a way to create a route on the map in this one. The bar at the bottom appears to be where an option like that might appear, but tapping on it just causes the app to immediately crash. I did try creating a few waypoints, but I couldn’t find a way to create a route that follows them. 
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Ein Witz das Ganze

Hat jemand eine Navi App im Auto, wo die Straßen nicht eingezeichnet sind? Das wichtigste an einer Seekarte sind die tiefen Linien und die Untiefen. Das ist ein Witz das Wichtigste vom ganzen fehlt. Setzen fünf. 😂

useless App

no function to import downloaded chats, thus not for offline use.
insufficient info content for navigation.

Guter Ansatz…

…aber ich frage mich, ob ich die Entfernung zwischen zwei Punkten messen kann. Sie wird auch zwischen Wegpunkten nicht angezeigt. Das schränkt die Brauchbarkeit für die Planung schon sehr ein. Leider finde ich auch keine Dokumentation zur Funktionalität.

Totally ????

Unless you have microscopic eye; u don’t buy PRO u will sail blind

Developer apps

FAQ

What is OpenSeaMap?

OpenSeaMap is a free, open-source project that creates a worldwide nautical chart. It provides detailed nautical information, weather data, and harbor details, functioning as an add-on to OpenStreetMap.

Does OpenSeaMap offer offline navigation?

Yes, OpenSeaMap allows for offline caching of up to 1 million map tiles. This feature enables navigation even without an internet connection.

How much does OpenSeaMap cost?

The OpenSeaMap app is free to download and use. However, it offers an optional in-app purchase called "PRO" to support future development and new features.

What devices is OpenSeaMap available on?

OpenSeaMap is available for iPhone and iPad devices, as indicated by its supported devices list.

Is OpenSeaMap suitable for professional navigation?

OpenSeaMap is a valuable tool but should not be relied upon as the sole source of information for navigation. It cannot replace official sea charts and should be used in conjunction with them and according to regulations.

Does OpenSeaMap provide depth information?

No, the OpenSeaMap product does not provide depth information. Users should be aware of this limitation when using the app for navigation.

How often is OpenSeaMap updated?

The app was last updated on July 8, 2025, with version 4.2. This indicates a recent update, suggesting ongoing development and support.

What is the age rating for OpenSeaMap?

OpenSeaMap has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in nautical activities.