GPS Anti Spoof
sextant sight analyzer
About
Instantly compare observed celestial navigation altitudes with live calculated values. This tool helps mariners detect GPS spoofing and functions as a celestial navigation trainer, offering instant feedback without paperwork.
What's New in GPS Anti Spoof
1.40
June 4, 2026
maintenance updates
Developer apps
FAQ
What celestial bodies are included in GPS Anti Spoof?
The standard version includes data for the Sun, Venus, and two stars. The Pro version expands this to include the Sun, Moon, Venus, Mars, Jupiter, Saturn, the 57 standard navigational stars, and Polaris.
Can GPS Anti Spoof be used without an internet connection?
Yes, the app functions off-network and at sea. The standard version works off-network for three days, while the Pro version can function for weeks without network access.
How accurate are the calculations in GPS Anti Spoof?
The ephemeris data is generated from JPL numerical integrations, ensuring accuracy to one second of arc for coordinates and a tenth of a minute of arc for displayed altitudes.
Does GPS Anti Spoof have ads?
No, GPS Anti Spoof does not contain advertisements.
What is the price of GPS Anti Spoof?
GPS Anti Spoof is available for a one-time purchase of $3.99.
How does GPS Anti Spoof help with GPS spoofing detection?
By calculating the exact altitude that should be observed based on celestial bodies and comparing it to your observed altitude, the app can highlight discrepancies if your GPS position is incorrect due to spoofing.
What age rating does GPS Anti Spoof have?
GPS Anti Spoof has an age rating of 4+, making it suitable for a wide range of users.
How often is GPS Anti Spoof updated?
The latest version, 1.0.39, was last updated on September 1, 2025, indicating regular maintenance and updates.
