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

On the water in a bad storm and your chart plotter just failed? Download this app now. iSailGPS NZ' 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. Better yet, buy iSailGPS NZ today so you will already have it if you find yourself in this situation, even in an area with no cell service.


Record a track. View it on the chart, and in a speed and course graph. Record in the background. View date & time of track points.

Mark waypoints by their position on a chart or satellite map, by searching for a place name or address, by tapping a geotagged photo, or by projecting from a known point. 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, KML or TCX files. Advanced route editing.

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

Send data to display immediately in Google Earth.

View and share the sun and moon position and rise & set times for any time and any place on earth.


No extra charge for access to all LINZ NZ Mariner Raster Nautical Charts, with no sign up, no subscription, no in-app purchase required. Download using WiFi or cell service. Charts from our server have a shorter download time and use less of your monthly data allotment.

Store a few charts or charts for the whole country to use anytime at sea without cell service.

Switches automatically between downloaded charts as you sail. Choose detailed or overview charts.

Stitches Mercator charts for seamless coverage across chart boundaries.

Enjoy the high resolution and what's-all-around detail of the NZMariner Raster Nautical Charts (RNC). They are a welcome advantage over Vector Charts, which only show a coastline, depths, navigation aids, and minimal details.

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

Measure distance between any two points.


Kilometers, Miles, or Nautical Miles. Meters or Feet.

Degrees, Degrees/Minutes, Degrees/Minutes/Seconds, UTM, or NZTM2000 grid.

°True or °Magnetic.


Tap Help in the app.

Online Manual on

Email developer:


The Land Information New Zealand raster nautical charts in iSailGPS NZ differ from computer-drawn vector charts in that each chart covers a specific area, the same way a paper nautical chart does. Switches automatically to a new chart when your boat leaves the area covered by the previous chart. For many locations, there are multiple charts at different scales with different levels of detail & areas of coverage.

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

iSail GPS NZ is priced to make it readily available to all boating enthusiasts.

DEVICE REQUIREMENTS for this version

No device requires a cellular data plan to use iSail GPS NZ.

iPhone 4S or later, and all WiFi+cellular iPads (iPad 2 or later) support full navigation.

iPad 2 or later with WiFi-only, and 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.

Sailing becomes safer and more fun with iSail GPS NZ!

What’s New

Version 9.2.5

I'm continually improving this app so it will be even more useful! With this version you can view the moon's phase and you can create a waypoint by simply entering an address.

iSailGPS NZ' 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.

Check the App Privacy section. We don't know who you are when you are using iSailGPS NZ. We never send your current location or your recorded track to our servers. Hence we cannot and don't use your location data. We cannot and don't provide your location data to anyone else. Many other mapping apps do profit from using your location data in ways that do not keep it private.

App Privacy

The developer, James Associates Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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