iPhone Screenshots

iPad Screenshots


- 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.
- GPS, Galileo, GLONASS, QZSS full support.
- Latitude & Longitude, and WGS84 included by default.
FREE BONUS (for limited time): The Coordinates-Pro feature adds additional coordinate systems and datums to the app to let you accurately work with many paper maps and charts used by civilians, U.S. military and NATO forces for walking, sailing, and flying. The coordinate systems and datums included are:
- Geodetic
- 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 working in the satellite space industry. He is a 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 in Version 3.2

Support for iPhone XS, XS Max, XR and latest iPad versions.







189.5 MB

Game Center


VPP Device Licensing



Rated: 4+


iOS 8.0 or later


iPhone 11 Pro Max, iPad Air 2 (Cellular), iPad mini Retina (Cellular), iPad Pro (11-inch), iPad (5th Generation) Wi-Fi, iPad (6th generation) Wi-Fi, iPod touch (6th Generation), iPad Pro (11-inch) Wi-Fi + Cellular, iPad (6th generation) Wi-Fi + Cellular, iPad Pro 12.9-inch (3rd generation), iPad (5th Generation) Wi-Fi + Cellular, iPad mini (5th Generation) Wi-Fi + Cellular, iPad mini (5th Generation), iPad Pro, iPad mini 3, iPad mini 4 (Cellular), iPad mini 4, iPhone 11, iPod touch (7th generation), iPad mini 3 (Cellular), iPad Air, iPad Air 2, iPad Pro 12.9-inch (2nd generation), iPad Pro (Cellular), iPad Pro (9.7-inch) (Cellular), iPad Pro (10.5-inch) Wi-Fi + Cellular, iPad Pro (9.7-inch), iPad mini Retina, iPad Air (Cellular), iPad Air (3rd generation) Wi-Fi + Cellular, iPhone 6 Plus, iPad Air (3rd generation), iPad Pro (10.5-inch), iPad Pro 12.9-inch (2nd generation) Wi-Fi + Cellular, iPhone 6, iPhone XR, iPhone XS, iPhone 6s, iPhone SE, iPhone 7 Plus, iPhone 6s Plus, iPhone 5s, iPhone X, iPhone 8, iPhone XS Max, iPhone 8 Plus, iPhone 7, iPhone 5, iPad (7th generation) Wi-Fi, iPhone 5c, iPad (7th generation) Wi-Fi + Cellular, iPad Air3, iPad Air3Cellular, iPad Mini5, iPad Mini5Cellular, iPhone 11 Pro, iPad Pro 12.9-inch (3rd generation) Wi-Fi + Cellular


English, Arabic, Catalan, Chinese, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Slovak, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese

Customer Ratings

All Versions

5 Ratings

Customer Reviews

Great app

Version 3.2
It is worth using this to get a GPS lock before opening map related apps - as it so much faster.
Secondly it gives you UK grid co-ordinates so if you are map reading it confirms your location


Version 3.1
I was having issues with navigation apps (Apple Maps, Google Maps and Waze) frequently losing track of where I was, when driving. Thanks to this app I was able to see that the GPS signal strength dropped massively when I started the engine, and so the apps were trying to navigate using cellular - no wonder they got lost. I repositioned my aftermarket CarPlay receiver, which was causing interference, which fixed the problem - but without this app I was thinking I'd need to get an expensive phone repair.
Thanks! Worth every penny.

Very useful

Dorset sculpture
Version 3.1
Great app.

Excellent App and very helpful support!

Version 3.1
I’d been having trouble Strava not working properly and no one could help identify if it was their app or my phone. Downloading this app helped identify that my phone GPS was only working on phonemasts/WiFi locations and it wasn’t picking up satellites. An email to the developer was responded to very quickly with a long list of helpful info that helped identify it was my phones GPS antenna at fault - these are £4 on eBay and £40 for a phone shop to install - all sorted now! Thanks for all your help!


Zebda Jax
Version 3.1
Helped to solve my gps signal problems. Highly recommend.

App does as it says

Version 3.1
Very good useful app for those of us that like to see the details of what is going on. I would like the bar charts to show individual bars for at least 18 satellites. This would make it even better for me, when wanting to know more detail for drone navigation. I have given a 5 star rating though for it’s current capability.

Excellent app

Being Shak
Version 3.1
Does what it says. I have been having problems resetting my location. Navigation apps wouldn’t pick up my location or follow my movements. Someone would work but delayed in picking up reception. I have tried turning on off the gps, reset phone etc. Nothing worked properly but this App can reset my location every single time. A great app if you are having gps issues! Highly recommended.

If you need it, you need it badly

Version 3.1
I take the GPS on my iPhone seriously. This app gives me the information I need.
If you don't look beyond AppleMaps or GoogleMaps, you won't know what I'm on about.
If you're prepared to go under the hood, get this app. It's useful and it works.

Accurate and informative.

Version 2.9


Version 2.9
Good and useful app. Does what it claims .... and accurately

Works Well

Version 2.9
Would like the ability to view/list satellite information I'm locked onto.

Accurate, clear and intuitive.

Version 2.8
Really useful

Good App

Version 2.8
Works well would be even better with OS coordinates

Helped fix Google maps

Professor Karizmo
Version 2.5
Thanks for this brilliant app - can't recommend enough for those like me whose location on Google Maps sometimes froze. Great value for money.

GPS Diagnostic

Version 2.4
A very handy app, good work!

Very good app

Steve Lane
Version 2.4
This app does all I needed it to do.


Phil welsh
Version 2.4
I've now used this app on several occasions. I've found it to be very accurate and does exactly what I require.

Great App

Version 2.4
Does what it says on the tin. Detailed information on the status of my GPS and signal reception quality.

GPS Reference tool

Phil welsh
Version 2.1
This is a fantastic app. I'm using it alongside other apps as a confidence checker or to find out what's really happening if a navigation app can't find its location or has poor performance

Excellent GPS Diagnostic Tool

Version 2.1
First rate app that does exactly what the description says. The developer responds to questions very quickly. A very useful tool for GPS problems.

Excellent GPS tool

RF guru 4211
Version 2.1
I wasn’t sure if my GPS was working correctly but after using this app I know everything is ok. The satellite signal-strength chart is excellent and sensitive to changes in location. It’s really useful for finding a GPS signal or improving the reception, and it updates in real time. The app is easy to use and works perfectly.