OpenSeaMap

OpenSeaMap

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Logo of OpenSeaMap

OpenSeaMap: The World’s Leading Open-Source Nautical Chart

Access free worldwide maritime data, harbor info, and weather layers. Navigate your next coastal adventure with powerful offline maps built for the recreational boating community.

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Publisher

appdoctors UG (haftungsbeschraenkt)

Category

Navigation

Downloads

222K+

User Rating

2.8/5

Total Ratings

300

Locales

3

Chart Your Course

Discover the interface used by 222K+ users.

OpenSeaMap app displaying a nautical chart of San Francisco Bay with coordinates and navigation markings

OpenSeaMap app displaying a nautical chart of San Francisco Bay with coordinates and navigation markings

OpenSeaMap app displaying a nautical chart of San Francisco with a live direction indicator and maritime navigation markers

OpenSeaMap app displaying a nautical chart of San Francisco with a live direction indicator and maritime navigation markers

OpenSeaMap nautical chart interface on a smartphone showing route planning with multiple waypoints and a compass overlay.

OpenSeaMap nautical chart interface on a smartphone showing route planning with multiple waypoints and a compass overlay.

OpenSeaMap mobile interface displaying a precipitation weather data overlay on a nautical chart

OpenSeaMap mobile interface displaying a precipitation weather data overlay on a nautical chart

OpenSeaMap mobile app waypoints screen showing bookmarked nautical locations and coordinate entry

OpenSeaMap mobile app waypoints screen showing bookmarked nautical locations and coordinate entry

OpenSeaMap settings screen showing nautical chart and navigation configuration options

OpenSeaMap settings screen showing nautical chart and navigation configuration options

OpenSeaMap mobile app interface showing a red nightview mode map of Long Beach

OpenSeaMap mobile app interface showing a red nightview mode map of Long Beach

Smarter Nautical Navigation Without the Subscription

The tools that make this app stand out, trusted by 222K+ users.

📡

Total Offline Reliability

Cache up to 1 million map tiles to your device so you can navigate with confidence even when cellular signals fade miles offshore.

💸

No-Cost Nautical Intelligence

Ditch expensive annual fees with a worldwide chart that includes weather data and harbor information powered by the OpenStreetMap project.

📍

Precision Trip Planning

Easily create and export waypoints, track your path in real-time, and enter direct coordinates for professional-grade route management.

Review Analysis

Insights from user reviews.

Sentiment Score

22%
Negative

Summary

This marine navigation app receives overwhelmingly negative feedback due to numerous critical functional and usability issues. Users frequently report app crashes, particularly on iOS 16.1.2, and a significant lack of core navigation features like depth information on charts, reliable offline map functionality, and the inability to create or display routes and waypoints. While some reviewers acknowledge the underlying quality and precision of the map data itself, the app's free access, and its basic utility for visual positioning or planning, these positive aspects are largely overshadowed by severe instability, outdated information, and poor user interface elements like unreadable text. Many users conclude it is unusable for serious navigation and a waste of money, even for the Pro version.

Common Themes

Map Data Quality(3)
Overall App Experience(2)
Price/Free Access(2)
Planning Utility(1)
Visual Positioning Aid(1)
App Concept/Potential(1)
Simplicity/Design(1)

About the app

Everything you need to know about OpenSeaMap.

Description

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.

Latest Version

4.2

Size

13.2 MB

First Released

Jan 25, 2012

Navigate Smarter with the World’s Free Nautical Chart

Join a global community of mariners. Download OpenSeaMap now for offline access to worldwide charts, waypoints, and weather data—all without a subscription.

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