GPS Diagnostic vs GPS Data
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GPS Diagnostic
This app tests your device's GPS module, providing precise navigation parameters and diagnosing location issues. It supports multiple satellite systems and offers advanced coordinate conversions through an in-app purchase.
- Test GPS module
- Fast GPS lock time
- Precise navigation parameters
- GPS "JumpStart" technology
- Full satellite system support
- Additional coordinate systems (IAP)
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KEY FEATURES: - Essential tool for your iPhone & iPad. - Test the GPS module. - Fast GPS lock time. - Precise navigation parameters. - Supplements operation of your navigation apps. - GPS "JumpStart" technology. - 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. - In-App Purchase: USNG, MGRS, UTM, OSNG, GEOREF, GARS & 174 Datums (free basic functionality). - **NEW** Smaller footprint (now only 35MBytes) - Free technical and customer support by email. -------------------------------------- OVERVIEW: - Lodestone Chart™ displays all essential GPS satellite information using a chart with only 4 bars. This dramatically simplifies the diagnostic process (Registered Copyright). - GPS "JumpStart" technology may resolve GPS problems with third-party navigation applications that have a frozen location, are slow to respond or are performing inaccurately. - 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. -------------------------------------- IN-APP PURCHASE (IAP) = "COORDINATES-PRO" This 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: - United States National Grid (USNG) - Military Grid Reference System (MGRS) -Old and New - Universal Transverse Mercator (UTM) - Ordnance Survey National Grid (OSNG) for Great Britain - World Geographic Reference System (GEOREF) - Global Area Reference System (GARS) - 174 Datums (e.g. WGS84, NAD83, NAD27, WGS72, ED50, ED79, OSGB36 etc....). -------------------------------------- REVIEWS: - 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." "Great app for kick starting navigation apps - This app finds a position every time and then all other nav apps work." "Excellent application - This was a much needed application for iOS devices." “I love the app. It’s been great to have when buying a new phone from eBay to check that the GPS is working. I had to return 3 phones last time before I got one with operational GPS.” "Awesome, over used term but this app is - This app does what other developers said they could not do." -------------------------------------- MORE INFORMATION: - 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.
GPS Data
Access detailed location data from your device, including GPS coordinates, elevation, speed, and direction. View information in a clear list format, with options for full-screen displays on iOS for at-a-glance monitoring while moving.
- Current time and update intervals
- Latitude and Longitude coordinates
- Elevation in meters and feet
- Speed in various units (mph, km/h, knots)
- Device and movement direction
- Local air pressure
- Vertical speed
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GPS Data delivers all of the current location information available from your device, including GPS, compass, and barometer data. GPS Data displays the following information, in an easy-to-use list format: • Current time • Time since last update • Accuracy of readings • Latitude & Longitude coordinates (decimal degrees and degrees/minutes/seconds) • Elevation (meters and feet above sea level) • Speed (meters and feet per second, kilometers and miles per hour, and knots) • Device direction (degrees true and degrees magnetic) • Direction of device movement (degrees true) • Local air pressure (hectopascals and inches of mercury) • Vertical speed (meters per second and feet per minute) Additionally, on iOS, any altitude, speed, or direction value can be expanded into a larger, full screen display, useful for monitoring different values when you're on the move.
Screenshots
Verdict
The clearest difference is price: GPS Data at Free against GPS Diagnostic's $2.99. GPS Diagnostic's advantage is ads (none vs shown) and rating (4.6 vs 4.4). On review sentiment, ratings volume, update cadence and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
GPS Data is free to download; GPS Diagnostic costs $2.99 up front. GPS Diagnostic sells 1 one-off in-app purchase and GPS Data sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
GPS Diagnostic holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 554 and 458 respectively. Written reviews split almost evenly too, at 78% and 77% positive.
GPS Diagnostic ships an update every 3 weeks, GPS Data fortnightly. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | GPS Diagnostic | GPS Data |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.6 (554 ratings) — better | 4.4 (458 ratings) |
| Positive reviews | 78.0% of reviews — better | 77.1% of reviews |
| Number of ratings | 554 — better | 458 |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #49 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 8.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 34 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | David Ryall | Oscar Fawkes |
Customer experience
GPS Diagnostic
GPS Data
User reviews
GPS Diagnostic
From 554 App Store ratingsWhat we love
- 👍 Helpful diagnostic tool
- 🚀 Provides detailed GPS information
- 🔧 Useful for troubleshooting GPS issues
- 💡 Allows resetting GPS receiver
- 👍 Clean and intuitive interface
Room to improve
- 🐛 Compatibility issues with newer iOS versions
- 🔍 Limited satellite data display (only 4 bars)
- 📝 Email support button not working
- 🔍 Lacks detailed information on satellite types
GPS Data
From 458 App Store ratingsWhat we love
- 📍 Accurate GPS coordinates and data
- ⌚ Apple Watch integration and standalone functionality
- 🎯 Simple, intuitive interface
- 📊 Displays comprehensive GPS data (speed, altitude, heading, accuracy)
- 🔄 Multiple unit options without changing settings
Room to improve
- ⏰ No updates for 4 years
- ⌚ Limited Apple Watch functionality and display
- 📺 Overlapping text and heading labels on display
- 💰 Ads present even in paid version
- 🔢 Excessive decimal places for coordinates
Bugs and requests
GPS Diagnostic
Reported bugs
2 issues- Crashes on startup for some users
- Fails to detect GPS signal on certain devices
Requested features
4 requests- Display number of satellites in view and locked
- Expand satellite signal strength graph to show more satellites
- Add support for landscape mode
- Provide more detailed GPS information (e.g., HDOP, VDOP)
GPS Data
Reported bugs
7 issues- App doesn't work on Apple Watch (no data displayed)
- Speed display shows only a dash on Apple Watch 4
- GPS coordinates not displayed on Apple Watch
- Compass doesn't work on Apple Watch
- Latitude/longitude format changes when sending via SMS
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- App crashes or shows no data for some users
- Text and heading overlap making data hard to read
Requested features
14 requests- Satellite lock count display
- Consolidated watch page with speed, course, and altitude together
- Apple Watch compass functionality
- Latitude/longitude display on Apple Watch
- Cardinal direction display on Apple Watch (N, S, E, W)
Show 9 moreShow fewer
- Remember last selected units on Apple Watch
- OSGB format support for UK users
- Location name (town and state) display
- UTC time display
- Snapshot/memory feature for GPS data
- Full-resolution timestamp in share feature
- Adjustable decimal places for coordinates
- Ad-free premium version
- More GPS readings and data types
In-app purchases
GPS Diagnostic
- Coordinates-ProFree
GPS Data
- Upgrade$3.99
Questions
Is GPS Diagnostic free?
Is GPS Data free?
Which has better reviews, GPS Diagnostic or GPS Data?
Do GPS Diagnostic or GPS Data have ads?
Which is updated more often, GPS Diagnostic or GPS Data?
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