What's New

I'm continually improving this app so it will be even more useful! This version adds the ability to create waypoints directly from the speed graph.
What's new in iSailGPS when compared with other available NOAA chart apps?
• You don't just see waypoints and routes displayed on the chart, you can actually do real great circle navigation to those waypoints and along those routes. You get information such as Estimated Time of Arrival, current bearing and heading, and remaining distance to your intermediate and final destinations.

• You don't just see individual charts. Whenever the map projection is compatible (which it is most cases), you can see adjacent charts with their margins removed stitched together seamlessly, even when the chart scales are different. For example you can see the approach chart and the corresponding harbor detail chart both together on the same screen.

• You can create, import, edit, export, and navigate both on routes based on a recorded or imported path, and on routes based on a series of waypoints.

• iSailGPS' s code size is kept very small by efficient programming so in an emergency, you can download it easily even over a weak cell connection.

App Description

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 Practical-Sailor.com

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.

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. Receive KML files from Google Earth.


No extra charge for access to all NOAA RNC Charts for USA waters. Download using WiFi or cell service.

Store up to 1024 charts to use anytime at sea without cell service. Charts from our server download faster & 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 and direction 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: isailgps.com
Email developer: [email protected]


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!

iPhone Screenshots

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i Sail GPS : NOAA USA Charts screenshot 1 i Sail GPS : NOAA USA Charts screenshot 2 i Sail GPS : NOAA USA Charts screenshot 3 i Sail GPS : NOAA USA Charts screenshot 4 i Sail GPS : NOAA USA Charts screenshot 5

iPad Screenshots

(click to enlarge)

i Sail GPS : NOAA USA Charts screenshot 6 i Sail GPS : NOAA USA Charts screenshot 7 i Sail GPS : NOAA USA Charts screenshot 8 i Sail GPS : NOAA USA Charts screenshot 9 i Sail GPS : NOAA USA Charts screenshot 10

App Changes

  • June 13, 2014 Initial release
  • September 13, 2014 New version 4.6
  • October 18, 2014 New version 5.0
  • November 03, 2014 New version 5.0.2
  • January 27, 2015 New version 5.0.3
  • May 02, 2015 New version 5.1
  • June 08, 2015 New version 5.2
  • July 01, 2015 New version 5.2.2
  • August 22, 2015 New version 6.0
  • October 15, 2015 New version 6.1
  • July 07, 2016 New version 6.2.2
  • July 15, 2016 New version 6.3
  • August 09, 2016 New version 6.3.1
  • November 06, 2016 New version 7.0
  • December 03, 2016 New version 7.0.1
  • December 20, 2016 New version 7.0.2
  • June 15, 2019 New version 8.2.7
  • June 20, 2019 New version 8.2.8
  • August 19, 2019 New version 8.2.9
  • September 11, 2019 New version 8.3.0
  • September 24, 2019 New version 8.3.1
  • November 11, 2019 New version 8.3.2
  • December 03, 2019 Price decrease: $7.99 -> $3.99
  • December 10, 2019 New version 8.3.3
  • December 10, 2019 Price increase: $3.99 -> $7.99

Other Apps From James Associates Inc.

i Hike GPS : Topo Maps i Hike GPS NZ : Topo Maps i Sail GPS NZ–NZMariner Charts