Features & Capabilities

The Pocket Nautical Chart

OpenSeaMap is a worldwide Opensource-project for creating a free nautical chart. Founded in 2009 the project gained a lot of attention lately adding more and more nautical information for free. Not even lights and other nautical infos are provided, but also more and more info layers like weather data, information about harbours and so on. As an add on to the OpenStreetMap this provides all missing info for nautical activities. OpenSeaMap is part of OpenStreetMap and uses the same database.

FEATURES:

  • Free worldwide sea chart (incl. HD chart graphics)
  • Search for geolocations worldwide
  • Chartplotting with continuous tracking
  • Waypoints can easily be created, edited, deleted & exported
  • Mark locations in the chart
  • Zoom chart optically to fit your preferred reading size
  • Enter coordinates directly to be displayed in the chart
  • Offline caching of up to 1 million map tiles
  • Cleanup of chart cache data at any time

To ensure future development and support of the OpenSeaMap app we encourage you to buy the In-App-Product "PRO". This will help keeping new updates and features coming.

DISCLAIMER: OpenSeaMap is part of the OpenStreetMap and uses the same database. As an experienced navigator you should NEVER rely your descisions on one source of information alone. Please keep in mind that the OpenSeaMap can not replace official sea charts on bord of your boat. Please use the OpenSeaMap app only in conjunction with official sea charts and conforming to national and international regulations. Please recognize that no depth information is provided by this product.

IMPORTANT: The continued use of the GPS can significantly decrease the battery level.

User Growth & Download Statistics

App
By:
appdoctors UG
Rating:
1.00
(1)
Version:
4.4 Last updated: 2026-04-27
Version code:
884944060
Creation date:
2012-01-25
Compatible devices:
Size:
13.16MB
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-06-06
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
appdoctors UG
Apple Apps Store
https://apps.apple.com/us/app/openseamap/id495210783
Website:
http://wiki.openstreetmap.org/wiki/OpenSeaMap_auf_iOS

User Reviews

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. 
by sh*****, 2025-11-21

had high hopes for open crowd sourced charting, this isnt it. for marine navigation, even google streetmaps on sat view has more detail. willing to be told im wrong, but i deleted it after 15 minutes.
by tu*****, 2022-12-16

iOS 16.1.2. It’s not usable. Crashes when I do anything.
by Fr*****, 2022-12-12
View all user reviews ›

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