Your iPhone or iPad becomes a high-performance GPS receiver with USA NOAA Raster Nautical Charts, even where there is no cell signal!

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” subscription 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 (MOB). 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.

Import files using a custom URL scheme.

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.

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.

Measure distance between any 2 points.

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 over the long run 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.

WiFi+cellular iPad 2 or later, & iPhone 4S 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 and to 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 8.2.3

Updated for iOS 12.1 and the new iPad Pros.
Paddling waypoint icon added.

Ratings and Reviews

2.5 out of 5
6 Ratings
6 Ratings
Dawg1966 ,

Says chart for lakes. Nope

I think we should be able to get our money back when the app developer misleads customers.

It states clearly that there are charts for lakes. NOT for the biggest lake in the country. Lake Texoma. I know their are charts, this app just can’t access them. Buyer be ware.

Developer Response ,

We apologize for not making our features description in the past as clear as it could have been on what areas are covered. We have updated the listings. iSailGPS uses the NOAA Raster Nautical Charts, so NOAA decides which areas are covered and which are not. See NOAA RNC charts include Lake Tahoe, Lake Mead, and the USA parts of the Great Lakes. For inland lakes and rivers in other areas, use our iHikeGPS topo maps app which has great shoreline detail, but not water depths.

Kiloechooo ,

App hangs up

Updated app on iPad. No longer works on iPhone. Hangs up during update. Delete, reinstall, won’t reinstall. But fix caused new bugsz

Developer Response ,

We are sorry for the problems you are having. While they don't affect most users, they are affecting your iPhone. Version 8.1.2 has been submitted to the App Store for Apple's approval. It should be available to you within the next few days. Please be sure that you have a reasonable amount of storage memory left on your iPhone before you try to update. If you continue to have problems, please contact us by telephone or email so we can help.

Baflo1251 ,


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


James Associates Inc.
13.9 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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