SEAiq

• Free to download
• In-app purchases

Last verified 31 Jul 2026

4.7 190 ratings · App Store

1. 4/5My favorite for beyond harbor

   We use SEAIQ and Navionics on a daily basis. Navionics primarily for new harbors in the US due to their sonar charts but we use SEAIQ whenever underway outside the harbor. There is room for improvement but likely features I am interested are geared towards weekend cruises whereas SEAIQ is focused on professionals. I still love it though.

   Roadsailor89 · 31 Jul 2026

2. 5/5Daily driver

   I have logged over 10k offshore sailing miles on SEAiq and consider it an essential piece of equipment. I highly recommend it to boaters wanting a highly reliable navigation app, which boasts tons of features in a clean and sensical interface. To start, it is incomparably more versatile than Navionics for plotting routes and waypoints, estimating AIS target crossing range, as well as visualizing vessel data. For the last bit I use a YDWR02 NMEA-Wifi router, which wirelessly transmits all vessel sensor output to SEAiq on my iPads (such as GPS, speed, wind, depth, etc.). Features I especially appreciate include ‘NMEA data smoothing’ (for an easier read on COG/AWS/SOG) and the ability to switch into ‘dark mode’ (to preserve your night vision). The app allows you to modify all kinds of parameters, enable alarms (wind speed, depth, AIS, anchor, etc.) and check tides, to name a few. Similar to OpenCPN, you can also load custom satellite charts (.kap files from GoogleEarth or VentureFarther) which are invaluable when navigating in places where vector charts are inaccurate (ie. Navionics in Fiji) and/or when anchoring around rocks/coral reefs. You can also load vector charts from subscription-based services like ChartWorld or NZ ENC, although I did find it quite complicated to setup initially (‘certificates’ and ‘user permits’ are required for each device). As a result, I often use SEAiq in tandem with Navionics while navigating in coastal waters, as the latter still offers great chart detail in most places. On the other hand, if you don’t plan on leaving US territorial waters, the NOAA charts in SEAiq are free and very easy to load. Furthermore, all chart files and tracks are saved in an easily accessible folder, so you can backup, modify or share them across devices. I have never had any charts accidentally disappear, nor has the app ever crashed on me (unlike Navionics, which does so constantly). Lastly, I am thankful to the developer, who was quick to answer any questions I have had thus far. The only request I would have is to add support for .MBTiles :) Thanks and keep up the good work! Highly recommend.

   opfrei · 31 Jul 2026

3. 1/5Miserable chart downloader

   Downloads, at least from the NOAA site, are excruciatingly slow in comparison to direct downloads from the site. Plus the app needs to be on screen with the iPad awake for downloads to complete. Any switching away can cause one or more chart downloads to fail, and you, rather than the app have to retry the update to pick up the missed charts. Lazy software design yields a poor user experience. The premium features would be worth the money but presumably the quality of the free version matches that of the paid version so no thanks.

   Delta Juliet Sierra · 31 Jul 2026

4. 5/5Great product for navigation.

   Great navigation app. Uses NOAA Raster and ENC charts. All the extras like tides and are integrated nicely.

   desk_navigator · 31 Jul 2026

5. 4/5Works with CM93 A-OK

   Nice. Now I can use the same charts on my iDevice as I can on OpenCpn, cm93. I installed the entire world on a iPod Touch 4. Rendering can be a bit slow/choppy when starting out, but seems to cache some information as it gets a bit better when viewing areas already viewed previously. Would be nice to get GPS data from a TCP/IP source instead of only built in GPS (since mine does not have one). Will also conserve battery life if the internal GPS can be disabled. I could see this product be a great companion to OpenCpn as new features are added to the product. If the developer could provide a good integration/complement to OpenCpn I think there would be lots of interest. Add some pages to repeat NMEA data and you could easily have a repeater for your Nav system as well (assuming they offer TCP/IP support for nmea data). Well done so far, and looking forward to updates.

   kiltym · 31 Jul 2026

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