SEAiq

SEAiq

by Sakhalin

181 ratings
54 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • June 1, 2012
  • February 19, 2026
SEAiq screenshot #1 for iPhone
SEAiq screenshot #2 for iPhone
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About

This marine navigation app offers comprehensive charting capabilities, allowing users to load various standard chart formats and download NOAA charts. It includes essential navigation tools like waypoints, routes, and an anchor alarm, along with weather overlays and NMEA/AIS integration.

Load custom S-57, S-63, iENC, BSB, KAP charts
Automatic NOAA chart downloads
Waypoints, routes, and tracks
Anchor alarm
Automatic weather downloads
NMEA and AIS integration
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What's New in SEAiq

5.6.0

February 19, 2026

* Minor improvements and fixes

1

In-App Purchases

$49.99

Upgrade for Premium Features

This upgrade enables many premium features, including: * Night colors * Waypoints and routes * Tracks * NMEA * AIS with CPA * Weather * Anchor alarm

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User reviews

No Access!!!!!

I just paid for the premium and am still getting no access to the features offered!!

Loaded with great features

So many good features. Only down side is it is a little tedious to plot a course. I wish they would simplify that

Daily 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.
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My 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.
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Good for S-63 charts

This app is one of the very few that supports official hydrographic charts (S-63).

The setup process is the simplest I have seen.

I have logged a bug about it and the team was responsive.

I would personally like to see it become a bit easier and more fully to use like Navionics although I do understand it is targeted at marine pilots and their needs.
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Developer apps

FAQ

What does SEAiq do?

SEAiq is a marine navigation application that provides comprehensive charting features. It allows users to load their own charts in various standard formats, download charts from NOAA, and utilize tools for waypoints, routes, tracks, and weather data.

What are the key features of SEAiq?

Key features include the ability to load custom charts (S-57, S-63, iENC, BSB, KAP), automatic NOAA chart downloads, waypoint and route management, an anchor alarm, automatic weather downloads, and WiFi-based NMEA and AIS integration.

How much does SEAiq cost?

The app can be used to view charts without any purchase. All features are available during a 7-day evaluation period. After this period, many advanced features require the purchase of an in-app upgrade.

What devices is SEAiq compatible with?

While the description doesn't explicitly state compatibility, it is a mobile application, implying it is designed for smartphones and tablets. Continued use of GPS may impact battery life.

What are common use cases for SEAiq?

Common use cases include planning and executing voyages, monitoring vessel position and weather conditions, setting anchor alarms, and integrating with onboard NMEA and AIS devices for enhanced situational awareness.