- Essential tool for your iPhone & iPad.
- Test the GPS module.
- Resolve GPS problems.
- Supplements operation of your navigation apps.
- If location cannot be determined then it diagnoses why.
- Assists you in changing conditions to get a reliable location.
- Geodetic Coordinates (i.e. Latitude & Longitude) and WGS84 Datum included by default.

COORDINATES PRO (In-App Purchase):

Work with multiple charts and maps. Super easy setup of coordinate systems and datums.

Credit: "The product was developed using GEOTRANS, a product of the National Geospatial-Intelligence Agency (NGA) and U.S. Army Engineering Research and Development Center."

- United States National Grid (USNG)
- Military Grid Reference System (MGRS) -Old and New
- Ordnance Survey National Grid (OSNG) for Great Britain,
- Global Area Reference System (GARS).

- 174 Datums (e.g. WGS84, NAD83, NAD27, WGS72, ED50, ED79, OSGB36 etc....)

- The developer is a professional software and hardware engineer, yachtmaster and pilot with a passion for navigation and Apple products.

- Consistent 5 star reviews, see what users are saying:

"Perfect Diagnostic Tool - This is the best app if you need to know the actual status of the internal GPS."
"Excellent application - This was a much needed application for iOS devices."
"Awesome, over used term but this app is - This app does what other developers said they could not do."

- Lodestone Chart™ displays all essential GPS satellite information using a chart with only 4 bars. This dramatically simplifies the diagnostic process (Registered Copyright).

- Uses the internal GPS of your iPhone or iPad.

- Includes a Speedometer, Altimeter and Compass.

- Location and altitude ( best-in-class accuracy and reliability )

- Speed (SOG) and Course (COG).

- Heading (i.e. Compass) with ability to turn on and off the manual compass calibration.

- Hardware information

- Accuracy of measurements shown for pro users.

- Imperial, metric and nautical units. These are the most commonly used and most useful navigation units. All easily changeable from the screen in use.

- Does not require internet access and does not use cellular data.

- Essential tool for any power user.
(e.g. navigators, yachtsmen, pilots, app developers)

- Share your location by text message, email etc. The format contains all essential information for improved accuracy.

- Works with Garmin Glo.

- GPS Diagnostic™ is a professional GPS test and measurement utility for your iPhone and iPad.

What’s New

Version 3.1

Application file size reduced by 50%.

Ratings and Reviews

4.6 out of 5
88 Ratings
88 Ratings
Help1222222 ,

Great resource

Great informative app used for diagnosing gps issue in iPhone. My gps stopped working and tried all software settings and restores to fix with no success. The app helped me find it out to be a hardware issue that needed a new “F antenna flex cable” replaced in the phone. 8$ later off amazon and I fixed the issue rather than having to buy a new phone with the help of this diagnostic. The creator was very informative and responsive to emails. Thanks man!

GeorgeReview ,

Missing Data

It does not include the types/makes of the satellites you are connected to.

This is important because it has to do with accuracy

Recently the FCC allowed U.S. customers to access the EU's Galileo satellites which are more accurate than the US's.

I want to know if I'm seeing / connecting to them.

cmaylo ,


For a paid app it could show a lot more detail gleaned from GPS data. There's a similar app on Android that does all this for free and it looks much better too, with toggles for dark sky friendly deep red theme.

If you need to see if your GPS actually works, I suppose this is it. I'd return it if it I could considering how lacking in features it is compared to similar offerings on other platforms, like GPS Test on Android.

In-App Purchases

Coordinate Systems: USNG, MGRS, OSNG, GARS...


David Ryall
188.9 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Arabic, Catalan, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
Age Rating
Rated 4+
© 2015 David Ryall
In-App Purchases
  1. Coordinates-Pro $1.99


  • Family Sharing

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

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