A comprehensive reference guide to symbols used on electronic nautical charts, based on IHO specifications. It offers quick lookup, detailed graphics, and offline access for navigation and revision.
10.0.0
September 19, 2026
* Updated for current iPhone and iOS versions * Save frequently used chart symbols to My Chart Symbols for quicker reference * Jump back to recently viewed pages, with older pages neatly grouped in one menu * Improved favourite and Home controls for clearer, more consistent navigation * Refined layout and spacing throughout the app
MoreIt is a reference guide to symbols used on electronic nautical charts (ECDIS) as specified by the International Hydrographic Organization (IHO). It helps users understand chart layouts, topography, hydrography, and navigation aids.
No, this app does not require an internet connection. It is fully functional offline, making it convenient for use at sea.
It covers hundreds of symbols across five main sections: General, Topography, Hydrography, Navigation Aids & Services, and Index & Abbreviations, based on IHO's INT 1 specifications.
Yes, the app features a 'Tap & Enlarge' function that allows you to view symbols in greater detail.
The app includes free bonus content from 'Safe Skipper,' offering tips on dealing with various maritime emergencies such as distress signals, engine failure, and man overboard situations.
This app is supported on iPhone, iPad, and iPod devices.
The app was last updated on August 30, 2017, to version 3.0. The developer has an ongoing program for marine navigation apps and welcomes user suggestions.
The app is available for a one-time purchase price of $1.99.
