SeaNav 4+

Marine Charts and Navigation

Pocket Mariner Ltd.

Designed for iPad

    • 4.3 • 166 Ratings
    • Free
    • Offers In-App Purchases


Explore, plan and navigate your boating trips in real time and outstanding high-resolution using digital charts derived from the latest NOAA and UKHO data providing coverage across the US and Europe (US, CA, UK & IE, DE, FR, NL, BE, DK, NO,ES,HR). Raster charts for US, NZ, FI & EE.

- Vector charts - all buoys, lights etc. are tappable
- Seamless fast panning and zoom across charts
- Route Planning and real-time tracking
- North up and course up displays
- Offline charts
- Configurable layers
- Built-in tutorial mode with full features including charts, AIS, AR & wind
- Tides, Streams & Weather
- Live AIS Ship positions and collision alarm (IAP)
- Import and share routes and POIs in GPX and KML formats via email and Dropbox
- Live Augmented Reality camera view (IAP) plus FLIRONE® night vision support.
- Includes free Apple Watch app with Nav,Waypoint,Wind,AIS faces.
- NMEA Depth, Wind Speed and Direction
- Real time local wind feed (IAP)

The free version includes all navigation and trip planning tools. High resolution vector charts are available by In App Purchase (IAP) including updates for 12 months.

Vector charts provide many advantages over traditional raster charts. Buoys, Lights, Bridges, Depth Contours, Depth Soundings, Rocks, Anchorage areas, NOAA Weather Buoys etc. are all selectable and have real time distance, bearing and detail information. Turn off layers to de-clutter the display and only show what is important at the time. Tides, moon and sun times and weather are also all available at your fingertips.

In-app tools let you measure distances and bearings and record waypoints on routes to sail. When you are out at sea, the app’s Sailing HUD shows your position on the route, Course over ground (COG), Speed over ground (SOG), Vector Made Good (VMG), Estimated Time of Arrival (ETA), Distance and bearing to next Waypoint. Waypoint reached alerts, auto-routing to the next waypoint and flashing collision alerts (with AIS).

Unique AR view mode (IAP) allows you to view buoys, lights, ships, waypoints, route and track overlaid on your iPhone or iPad live camera view. With "AR LockOn" you can select a target on the chart and then be guided to it in the AR camera view. You can also see at night and in the fog with the FLIRONE Infra-red camera.

External NMEA GPS, AIS and Wind data over Wifi.

GPS only required for real time route navigation. Optional Real time AIS, Tides and Weather information require an active internet connection.

WiFi-only iPad or iPods will need an external GPS receiver for navigation.

Please note that continued use of GPS running in the background can dramatically decrease battery life.

Our in-app purchases are 1 year subscriptions, which automatically renew at the end of the subscription period unless auto-renew is turned off at least 24-hours before the end of the current period. Payment will be charged to your iTunes Account at confirmation of purchase, and will be charged for renewal within 24-hours prior to the end of the current period. Pricing for our 1 year US Charts update subscription is $19.99.

Subscriptions may be managed by the iTunes account holder and auto-renewal may be turned off by going to Account Settings after purchase. 
No cancellation of the current subscription is allowed during active subscription period.

NOTICES: This product has been derived in part from material obtained from the UK Hydrographic Office with the permission of the UK Hydrographic Office, Her Majesty’s Stationery Office.” “© British Crown Copyright, [2012]. All rights reserved.

The UK Hydrographic Office (UKHO) and its licensors make no warranties or representations, express or implied, with respect to this product. The UKHO and its licensors have not verified the information within this product or quality assured it.

Terms of Use:

Privacy Policy:


What’s New

Version 5.4.3

DE,DK and NL demo routes and charts added
Multilignual support for UserGuide and FAQ
My Boat Details type can now be set - e.g. Sailing, Fishing, Pleasure, Diving etc.
Easier to see My Boat icon with boat type colour
Bridges, Shoreline and Traffic zones UI improvements
Fix for S.Cardinal light patterns
User guide and FAQ can now be read when offline too
Fix for route traversing international dateline

Ratings and Reviews

4.3 out of 5
166 Ratings

166 Ratings

Simeoniii ,

Excellent program

Had this installed for a while and I’m now beginning to use it. Integrates well with my Wind Instrument. The building of routes and importing waypoints stumped me but after reading the Help document.

After working with the app and companion app Boat Beacon, I am really impressed. Excellent response from help desk/support and they want user feedback to guide their future app updates. I am changing my rating from 4 to 5 stars.

Flip Flop Navy ,

Intuitive and accurate

I have had SeaNav for a year now and have learned to trust it. It is just as accurate as any high dollar system and is easy to use.

ice001234 ,

Does not work offline

Started out online and it seemed ok. I set a destination and selected “navigate here”. Then my route took me offline and things went bad. The application showed SOG, location, and ETA. It also displayed a line showing my route. Then I attempted to save a waypoint along the route. When I saved a waypoint, the application crashed. I re-opened the application and the only thing it showed was my location. It did not show speed, ETA, or my route anymore. User Guide and FAQ do not work without internet data connection. Crashes every time I select the sailboat icon.

Developer Response ,


Thank you for your feedback and contacting us via We have found that you were trying to sail a test route across the international date line ( +/-180) and this was causing the issue. This bug only affected routes crossing the +/-180 longitude and is now fixed with the latest version. We have also made the UserGuide and FAQ available offline as you requested.

App Privacy

The developer, Pocket Mariner Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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