GPS Anti Spoof

Validate GPS position with easy comparison to sextant altitudes

GPS Anti Spoof - Validate Your GPS Position

"GPS Anti Spoof" is an Android app designed for sailors and navigators to detect GPS spoofing by comparing GPS positions with calculated altitudes of celestial bodies. Using a sextant, the app provides instant celestial navigation and includes automatic corrections for various factors. It works offline, and can download temperature and pressure data when connected, ensuring accurate altitude calculations. All ephemeris data is sourced from JPL, guaranteeing precision for effective navigation.
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App stats

Users: 5,866
14
Rating: 3.00
(38)
Version: 1.0.37 (Last updated: 2024-11-27)
Creation date: 2017-12-02
Permissions
Location: approximate location (network-based), precise location (GPS and network-based)
Other: full network access

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App summary

Sextant required! Instant celestial navigation... The most reliable way to detect GPS Spoofing and other anomalies of electronic navigation is by comparing against the measured altitudes of celestial bodies including the Sun, Moon, bright planets and stars. This app calculates the exact altitude that should be observed with a sextant assuming that the GPS position is correct. No paperwork is required, no tables of corrections. All corrections are included automatically: index error, system time error, dip of the horizon, refraction, temperature and pressure corrections to refraction, altitude above sea level, parallax, and also gravitational deflection of the vertical (a correction of up 2 nautical miles not handled by any other celestial navigation sight-clearing product) are all included automatically. It's also a great sextant trainer: take a sight and immediately compare against the app's display. The app works off-network. If a network connection is available, it can download temperature and pressure information automatically. The ephemeris data is generated from the same JPL numerical integrations of lunar and planetary motions used by the official Nautical Almanac and Astronomical Almanac. All coordinates are accurate to one second of arc, and displayed sextant altitudes are accurate to better than a tenth of a minute of arc (the limiting precision of the best marine sextants).

User reviews

Excellent tool for practicing Celestial Navigators! I like to use it when taking actual sights with my sextant, the pause feature makes it very simple for an assistant to accurately freeze and record the time of your fix when you call "Mark!"
by Alastair Stewart, 2022-06-07

Does not work
by rdr2 pro, 2021-12-24

Great app. Unfortunatelly can use only the imperial system for height, temperature and pressure. Edit: after the latest update, the metric system was implemented. I appreciate your work! I would like to buy you a beer, but unfortunately I find the Pro version too expensive to justify it, for the amount of time I'm using the app. Any other way I can do it?
by Cristian Calin, 2021-05-19
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