OpenSeaMap is a crowd-sourced nautical navigation tool that integrates with OpenStreetMap to provide free global sea charts. It offers specialized layers for weather data and harbor information, alongside standard plotting and tracking capabilities.
Overview · Full Intel report in progress
The App DNA
What makes this app unique?
For Marine enthusiasts and sailors seeking a community-driven, open-source alternative to commercial nautical charting software.
Key features
Provides free worldwide sea charts with integrated nautical information, including lights and harbor data.
Supports continuous tracking, waypoint management, and manual coordinate entry for navigation.
Allows users to store up to 1 million map tiles locally for use without an active internet connection.
Features optical zoom functionality to adjust chart reading size and map detail.
How much does it cost?
Velocity
Intense developmentShow more...
5 versions in history. Development pace: intense.
Who built it?
appdoctors UG
9 apps tracked · Navigation
Sea Weather Professional
Hackerspace Bremen
Landlubber
Coordinates Pro
Tasks Pro
Terminal RSS
GDPR Helper
Sonnenstand ProUser Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for OpenSeaMap
How's the Navigation market?
The rivals identified
By Navico Norway AS
Both apps target recreational sailors and boaters with nautical charting and offline map capabilities, creating direct competition for the same user base.
- C-MAP provides high-resolution bathymetry for fishing, while OpenSeaMap relies on community-sourced general nautical charts.
- C-MAP gates essential navigation tools behind a subscription, whereas OpenSeaMap offers a free, open-source model.
- C-MAP supports GPX interoperability for hardware migration, reducing friction for users moving between devices.
Navionics® BoatingContender
TZ iBoat – Marine NavigationContender
Orca: Boat GPS, Charts, RoutesContender
Savvy Navvy Boating NavigationContender
Aqua Map BoatingContender
iNavX: Marine NavigationContender
NavilyContender
B&G: Companion App for SailorsContender
Unlock the head-to-head verdict: where this rival wins, and where it loses.
Access the full report for freeThe Analyst's Read
Key takeaways for OpenSeaMap
Where is it heading?
Bottom line
While the app offers a comprehensive feature set for nautical navigation, user feedback highlights significant concerns regarding stability, performance, and data detail compared to commercial alternatives.
Report last updated