SeaNav 4+

Marine Charts and Navigation

Pocket Mariner Ltd.

Designed for iPad

    • 4.4 • 137 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,PT). 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 5.4.7

Fix for viewing routes on older iPads on pre iOS16.

Ratings and Reviews

4.4 out of 5
137 Ratings

137 Ratings

MarkCX ,

Now ‘embiggened’ for iPhone X!

With the app now making full use of of the larger screen of the X iPhones, with the added weather detail, it’s even better! With AIS plotted as well, this app has much to offer with charts fairly priced too. I’m looking forward to seeing what’s going to be added next.

Developer Response ,

Hi Mark, Thanks for the great feedback. We have listened and the new version of SeaNav now supports full screen on the iPhone X. Its a free update. The latest version also adds an amazing animated weather view showing wind, waves, rain and pressure out to 10 days time.

John England ,

Updating pain

I’m a bit torn, but my rating is dominated by the difficulty (unless I’m missing something) of downloading and updating the charts.
After you buy them you can’t just download them and go, but have to scroll around the country uploading them in batches, plus smaller charts will only download if you zoom right in.

Even after a year I still find the odd teeny chart I’ve never downloaded. Now this is fine if you arrive at the place with an Internet connection, but less so otherwise if you don’t have a chart or have an old version.

So IMHO needs a button to say “I don’t have a data cap please download all the charts I’ve bought” and another to update them…

Spent several hours (!) today updating phone and iPad. Really had enough scrolling around and zooming in and out of a U.K. map for about a year… but bet I’m still missing a few.

Would also be nice to have a legend for symbols and colours (plus maybe a brief chart reading explainer) to let less maritime people look around out of curiosity, without bothering me… pretty please…

Developer Response ,

Hi John,

Thanks for your review and feedback. There is already a button in SeaNav to download all the charts for an area like other apps do. Go to Settings/Manage Charts and tap "Download charts". This will show and download all the charts for an area (at all scales) in one go and also let you see which charts you have ( green outline) and which are not downloaded (red outline). I hope this helps and please contact us directly at help@pocketmariner.con if you need more advice. We aim to get same day reply 24x7 for queries to our help desk.

adfschb ,

Revised rating

Initial set up problems had me struggling with this app and I’d just about given up until contacted by the developer who got me up and running. Great customer service and I’m going to enjoy using this new found wealth of information in the bays and inlets of the Western Isles. Thank you Steve Bennett, much appreciated.

Developer Response ,

SeaNav can be shared between upto 4 devices on the same account including iPhones and iPads. Can you please contact us at so we can get you set up.

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 based on, for example, the features you use or your age. Learn More

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SeaNav UK & Ireland
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SeaNav NP

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