CHRTsail

CHRTsail

Better charts & navigation

3 ratings
2 reviews
Free

Details

Released
September 4, 2026
Updated
September 26, 2026

Features

Background Location Access

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About

This app provides modern, vector-based nautical charts and navigation tools designed for today's mariner. It offers offline functionality, customizable chart displays, and real-time weather and tide information.

✓Vector-based nautical charts
✓Offline navigation
✓Customizable chart rendering
✓Real-time weather and tides
✓Cross-platform account sync
✓Live Activity and widgets
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What's New in CHRTsail

1.1.3

September 26, 2026

Some quick changes to production getting ready for launch: • Creating an account is easier. The first screen asks whether you already have one, explains what signing up commits you to before you start, and lets you see the password you're typing. The sign-up buttons now say sign up. • You can delete your account from within the app, no need to go to the web account page. It asks you to type DELETE so it can't happen by accident. • If you hid your email when signing in with Apple, the app now shows that it's a private relay address and explains that Apple forwards mail to you. It asks what to call you, shows your name — or My Account — in place of the relay address, and lets you set a different address for receipts and notices. • The 24-hour preview counts down in hours on the chart, and about an hour before it ends the app sends one reminder. • A planned line can now start from water the chart shows as deep enough. Depth at a point is read from the most detailed chart that covers it, so a coarser survey no longer blocks a start inside a harbour. When a start or end is still refused, the app shows which depth area it found and how far away it was. • On the account-created screen, the option to start again with a different email is now clearly tappable.

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User reviews

Beautiful charts, clear and easy

Hands down the prettiest, clearest charts I’ve seen. I’m a novice and started learning navigation on navionics, but CHRT totally blows them away. 🐳 You can reduce clutter on the charts and have it display super simply or expose everything you’d see on a paper chart. Since I’m learning, being able to tap everything on the charts and get more info has been extremely helpful. And still, by far, the WIDGETS are my favorite. They are so lovely. 😍😍
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Finally, usable vector charts

This app has solved the issue of defunct raster charts and poorly adapted vector charts. CHRT displays the things you need to see, is easily readable, and is highly adjustable in level of detail. Once you experience the lock screen widget, you’ll wonder how you ever went without it.

FAQ

What is CHRTsail?

CHRTsail is a navigation app that provides modern, vector-based nautical charts and advanced charting software for boaters. It is designed for both online and offline use, offering features like customizable chart displays and real-time weather and tide information.

Does CHRTsail have ads?

No, CHRTsail is ad-free. Users can enjoy an uninterrupted navigation experience without any advertisements.

What devices does CHRTsail support?

CHRTsail is available for iPhone and iPad. The same account can be used across these devices, as well as on Mac and in a web browser (beta).

How does CHRTsail handle offline navigation?

CHRTsail is built with an offline-first design. Users can download full chart regions before departing, ensuring continuous navigation even without a signal. Hazard alerts and other critical functions remain operational offline.

Can I customize the charts in CHRTsail?

Yes, CHRTsail offers full control over chart rendering. You can choose between official IHO S-52 ECDIS symbology or a softer house style, and adjust detail levels from overview to full harbor complexity.

What kind of weather and tide information does CHRTsail provide?

CHRTsail provides real-time weather, tides, and currents. It uses NOAA harmonic tide data and includes features like barometric pressure trend logging, which functions without a network connection.

How often is CHRTsail updated?

The latest version of CHRTsail is 1.0.2, which was last updated on September 5, 2026. Updates are released to improve functionality and add new features.

What is the age rating for CHRTsail?

CHRTsail has an age rating of 4+. This indicates it is suitable for a wide range of users, including younger individuals, though its primary audience is adult mariners.