i Sail GPS : NOAA Charts at App Store analyse

App power index: 3667 (based on ranks around App Stores today)
Travel Navigation
Developer: James Associates Inc.
Price: 0 free
Current version: 8.1, last update: 1 month ago
First release : 29 Apr 2011
App size: 11.37 Mb
4.0 ( 4480 ratings )
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Estimation application downloads and cost

> 80.67k
Monthly downloads
~ $ 33k
Estimation App Cost

14 Jul 15 Jul 16 Jul 17 Jul 18 Jul
791 + 209 959 -168 687 + 272 589 + 98
Your iPhone or WiFi+Cellular iPad becomes a high-performance GPS receiver with offline USA NOAA Raster Nautical Charts!

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” 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 dont 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 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!
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Available in countries
Country Price
Canada 10.99 CAD
China 50 CNY
France 8.99 EUR
Germany 8.99 EUR
Italy 8.99 EUR
Netherlands 8.99 EUR
Portugal 8.99 EUR
Spain 8.99 EUR
Poland 8.99 EUR
UK 7.99 GBP
India 599 INR
Japan 960 JPY
Poland 37.99 PLN
Russia 599 RUB
Turkey 34.99 TRY
USA 7.99 USD
Korea, Republic Of 8.79 USD
Ukraine 7.99 USD
Available for devices
iPhone3GS, iPadWifi, iPad3G, iPhone4, iPodTouchThirdGen, iPodTouchFourthGen, iPad2Wifi, iPad23G, iPhone4S, iPadThirdGen, iPadThirdGen4G, iPhone5, iPodTouchFifthGen, iPadFourthGen, iPadFourthGen4G, iPadMini, iPadMini4G, iPhone5c, iPhone5s, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPhone6, iPhone6Plus, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPodTouchSixthGen, iPhone6s, iPhone6sPlus, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPhoneSE, iPhone7, iPhone7Plus, iPad611, iPad612, iPad71, iPad72, iPad73, iPad74, iPhone8, iPhone8Plus, iPhoneX,

Latest version i Sail GPS : NOAA Charts: 8.1

Imports KML files.

Apps Changes History:
  • 3 months ago: New App Version 8.0.3 ☛ 8.1
  • 7 months ago: New App Version 8.0.2 ☛ 8.0.3
  • New App Version 3.99 -> 0
  • New App Version 7.99 -> 3.99
  • 7 months ago: New App Version 8.0 ☛ 8.0.2
  • 8 months ago: New App Version 7.1.3 ☛ 8.0
  • 10 months ago: New App Version 7.1.2 ☛ 7.1.3
  • 1 year ago: New App Version 7.1.1 ☛ 7.1.2
  • 1 year ago: New App Version 7.1 ☛ 7.1.1
  • 1 year ago: New App Version 7.0.2 ☛ 7.1

We thought this would be a good app as we seen good reviews.....does not work for Canadian waters......did not even get to try.....waste of money for us


Can only get very large scale maps for Canadian waters. Dont buy for Canada

Doesnt work for me

There are no maps for the Tennessee River, I want my money back.

Server problems

Constantly fails when downloading charts. Do not buy!

Great apps!

I purchased both iSail and iHike apps this year and they are both TERRIFIC! They were easy to download and easy to used. I sailed both offshore and inside small harbors in New England and found the iSail app to be incredibly useful. I chartered a sailboat this year and the chartplotter mounted on the boat was old and lacked detail. I found the iSail app especially useful when going in and out of small harbors, which required knowing precisely where I was relative to the shallow areas, which I needed to stay away from. It was no problem holding my iphone while steering the boat. I still brought hard copy maps and used the boats compass, but this app greatly enhanced my ability to safely navigate, especially in tight places. iHike performed just as well when I went horseback riding on 80 miles of unmarked trails in Colorado in a area that was "off the grid" (I gave a separate review on the iHike site). Thanks for making such great apps!

Excellent navigation app!

I use this app every time I sail. It is accurate, has many great options and has a very detailed help section. I reported a minor issue and a new version with the fix was released within a few days.

Not recommended

This app seems to consume the processor, as zooming in / out and moving the map around takes several seconds to respond, and battery life is short when its running. It was the only app I could find to show GPS position on a NOAA chart, but it really needs work to make it more responsive.

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