CHRTsail

CHRTsail

Better charts & navigation

4 ratings
2 reviews
Free

Details

Released
September 4, 2026
Updated
October 20, 2026

Features

Background Location Access

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CHRTsail screenshot #9 for iPhone
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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

1.2.0

October 20, 2026

Charts • The chart now draws in Raster by default, the paper-chart look. S-52 is a tap away in settings. • Resize chart labels and symbols; rocks and wrecks now start smaller. • A coarse chart no longer raises a shallow alert where a more detailed chart covers the spot. • Grounding alerts and depth shading now start turned off. Turn them on in the settings drawer. • A live DANGER is now a magenta dot on MENU. • When online charts fail, MOB, REC, NAVIGATE and the anchor watch stay on screen. • Offline charts say when CHRT's chart list was last checked. • The measure tool now takes more than two points. • Bearings can read magnetic, from NOAA's World Magnetic Model. Routes • An open route's name and size now sit in the header, by a back arrow. • A long route's waypoint list now scrolls from any row. • Seven things that could not be undone now ask first, such as deleting a route or mark, or removing a boat. Weather • WEATHER opens on the chart, with every reporting buoy on it. • WEATHER now draws every station CHRT lists as reporting in view. • PAST reads back the last 48 hours, one reading at a time. • What a buoy does not report is one line now, not eight. • A buoy reading CHRT would not refresh now stays, marked NOT REFRESHED. • FORECAST draws the marine zone your forecast came from, lets you tap another zone, and names the closest zone where none covers you. Faster and smoother • MENU opens without the pause it had. Accounts • A new account gets 24 hours before a card is asked for. • The account screen offers the subscription you can actually start. • Sign-up and sign-in no longer flash screens they then take back. • Apple's button now says Sign in on the sign-in form. • A fresh install now asks you to sign in again; an update does not. • Deleting an account that signs in with Apple asks Apple to confirm. • A crew invitation the server did not cancel stays open. CHRTsail is for situational awareness only. It is not a certified navigation system (not SOLAS-compliant). Always navigate with official charts and proper equipment.

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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.