Report updated Apr 18, 2026
GPS Diagnostic: Satellite Test
For power users including professional navigators, yachtsmen, pilots, and app developers requiring high-precision GPS diagnostics.
GPS Diagnostic: Satellite Test is a market-leading navigation app that is a paid app. With a 4.7/5 rating from 541 reviews, it delivers strong user satisfaction. Users particularly appreciate hardware diagnostic utility, though limited satellite visualization remains a common concern.
What is GPS Diagnostic: Satellite Test?
Current Momentum
v3.6 · 70mo ago
ZombieThe app is currently in maintenance mode, with no updates released since June 2020.
Active Nemesis
MilGPS
By Cascode Labs Pty
Other Rivals
7-Day Rank Pulse 🇺🇸
NavigationRating Pulse 🇺🇸
Recent User Mood
What makes this app unique?
What Does It Look Like?
Loading...
What Are The Key Features?
Proprietary technology to resolve frozen, slow, or inaccurate location data in third-party navigation apps.
Simplified diagnostic visualization using a 4-bar chart to display satellite information.
Support for USNG, MGRS, UTM, OSNG, GEOREF, and GARS via IAP.
How much does it cost?
- $2.99 Upfront Purchase
- Coordinates-Pro IAP for advanced coordinate systems and datums
The app uses a low-cost upfront purchase model targeting professional users, with specialized IAP for military and survey-grade coordinate systems.
Who Built It?
Equipping professional navigators and developers with high-precision GPS diagnostic tools to verify hardware and resolve location freezes.
Portfolio
1
Apps
Explore the full David Ryall report
Portfolio breakdown, audience, momentum, and every app published by David Ryall.
What do users think recently?
High confidence · Latest 100 of 541 total reviews analyzed
How did the latest release land?
What is the recent mood?
Recent user voice shows a thrilled sentiment. Users appreciate hardware diagnostic utility and simplicity and ui design, but report limited satellite visualization and device compatibility issues.
What Users Love
What Frustrates Users
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for GPS Diagnostic: Satellite Test?
Where is it available?
Localized markets (20)
How's The Navigation Market?
How does it evolve in the Navigation market?
Rank progression
152 active rankings tracked — 30-day window
The rivals identified
The outtake for GPS Diagnostic: Satellite Test
Strengths to defend, gaps to attack
Core Strengths
- Proprietary JumpStart technology
- Offline functionality (no data required)
- Professional industry-expert pedigree
- Small 35MB footprint
Critical Frictions
- No updates since June 2020
- Visualization limited to 4 satellite bars
- Lack of landscape mode
- Reported issues with newer hardware (iPhone 11)
Growth Levers
- Expand satellite visualization to 8+ bars
- Add landscape orientation for cockpit mounting
- Modernize UI for latest iOS versions
Market Threats
- MilGPS (active updates and 10x scale)
- OS-level changes breaking legacy diagnostic calls
- Competitors adding HUD or mapping features
What are the next best moves?
Expand Lodestone Chart to 8+ bars
This is the #1 user request and a high-frequency complaint theme among power users who find 4 bars insufficient for professional diagnostics.
Release compatibility update for newer iOS/Hardware
Users report the app fails to display satellites on iPhone 11; the 4-year maintenance gap is creating a churn risk as hardware evolves.
Implement Landscape Mode
Specific user feedback identifies the lack of landscape support as a barrier for professional use in mounted environments.
Feature Gaps vs Competitors
- Offline mapping and waypoint navigation (available in MilGPS)
- Heads-Up Display (HUD) mode (available in Speedometer 55)
- Active compatibility with latest iOS hardware (available in MilGPS)
Key Takeaways
GPS Diagnostic is a high-utility legacy tool with a unique 'JumpStart' moat, but it is currently at risk of obsolescence. To defend its #32 category ranking against the actively maintained MilGPS, the PM must address the 4-year update gap and expand satellite visualization beyond the current 4-bar limit.
Where Is It Heading?
Declining
Last updated June 2020 — indicates maintenance mode rather than active investment.
Ranked #32 Paid (↑48) — shows resilient demand for the core diagnostic value proposition.
User mood is 'Excellent' but technical complaints regarding iPhone 11 compatibility are emerging.