Your iPhone or WiFi+Cellular iPad becomes a high-performance GPS receiver with offline USA NOAA Raster Nautical Charts!

Rated “Best Choice — Excellent” by

On the water in a bad storm and your chart plotter just failed? Download this app now. You will have full navigation capabilities to get safely back to port. Better yet, buy iSailGPS today so you will already have it if you find yourself in this situation, even in an area with no cell service. No sign up, ads, subscription, or in-app purchase required, making this less expensive & less hassle than the “free” apps.


▶ Record a track. View it on the chart and in a speed graph. Record in the background. View time of track points.

▶ Mark waypoints by their position on a chart, by tapping a geotagged photo, by projecting from a known point, or by searching place names. Refine a waypoint position when you arrive.

▶ Set a quick GoTo waypoint or a full route and see the course (COG), heading (HDG), bearing (BRG), direction, distance, cross track error (XTE), Velocity Made Good (VMG) and Estimated Time of Arrival (ETA) at your destination and intermediate points.

▶ Man Overboard. With one button push, mark your current position & start navigating to it.

▶ Create routes using waypoints, recorded tracks, or imported GPX or KML files. Advanced route editing.

▶ Import & Export GPX and KML waypoint, route & track files via eMail, Messages, Import With, AirDrop, iCloud Drive, Dropbox or iTunes.

▶ Send KML files to display immediately in Google Earth.


▶ Forever-free access to all NOAA RNC Charts for USA waters. Download using WiFi or cell service.

▶ Store up to 750 charts to use anytime at sea without cell service. Charts from our server have a shorter download time, use less of your monthly data allotment & use less storage.

▶ Stitches charts and automatically switches between downloaded charts as you sail. Choose detailed or overview charts.

▶ Print and Share map images overlaid with waypoints, routes & tracks.

▶ NOAA charts don't include most inland rivers & small lakes. Use our iHikeGPS app for these.


▶ Tap Help in the app.

▶ Online Manual:

▶ Email developer:


The National Oceanic & Atmospheric Administration provides both RNC (raster) and ENC (vector) charts.

The great advantage of the high resolution RNC charts used by iSailGPS is the high level of detail produced by professional cartographers that is unobtainable on any vector-based chart. ENC Vector Charts only show a coastline, water depth, navigation aids & minimal details.

These RNC Charts differ from vector charts in that each chart covers a specific area, just as paper nautical charts do. Switches automatically to a new chart when your boat leaves the area covered by the previous chart. For most locations, there are multiple charts at different scales with different levels of detail & areas of coverage.

Paper charts can have multiple panels, each showing a different area or scale. Each digital panel is individually displayed by iSailGPS with a north-up orientation.

Other, more expensive marine software uses these same RNC charts. iSail GPS is priced to make it readily available to all boating enthusiasts.


● No device requires a cellular data plan to use iSailGPS.

● iPad 2 or later with WiFi+cellular, & iPhone 4 or later support full navigation.

● iPad 2 or later with WiFi-only, & iPod touch (5th gen or later) require an iOS-compatible external GPS receiver to show your location on the water & record tracks. View charts using the iOS device alone.

● Continued use of GPS running in the background can dramatically decrease battery life.

Winner of the Practical Sailor Editors’ Choice Award

Sailing becomes safer and more fun with iSailGPS!

What's New

Version 8.1

Imports KML files.

Ratings and Reviews

3.9 out of 5

7 Ratings

7 Ratings

My favorite app


I have used many apps for marine navigation. I have settled on this beautiful app as my favorite. Did you know that it is one of the only apps in this genre that will work on the iPad1? Not only does it use NOAA charts by our gov't but it can also stitch them together.
The documentation is just excellent.
I feel that you can become a fan of this application.



Really a very useful app with lots of functionality though not totally intuitive - need to review the instructions. The charts alone make the app worth having. Use extensively while sea kayaking.
Strongly recommended



I’ve been using this app for about a year and I am throughly impressed and happy with it.


James Associates Inc.
11.9 MB
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© 2018 James Associates Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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