
GPS Anti Spoof
Validate GPS position with easy comparison to sextant altitudes
App info
App description
Android App Analysis and Review: GPS Anti Spoof, Developed by Clockwork Mapping. Listed in Maps & navigation Category. Current Version Is 1.0.38, Updated On 22/04/2025 . According to users reviews on Google Play: GPS Anti Spoof. Achieved Over 6 thousand Installs. GPS Anti Spoof Currently Has 38 Reviews, Average Rating 3.0 Stars
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).We are currently offering version 1.0.38. This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover, you can download without registration and no login required.
We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.
It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.
What's New
maintenance update
Recent Comments
Alastair Stewart
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!"
Cristian Calin
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?
A Google user
Awesome app. A must for both seasoned and aspiring celestial navigators.
A Google user
there is level that seems to cap..
First Last
Does not work offline.
rdr2 pro
Does not work
A Google user
Excellent app. A great way to hone one's sextant skills.
A Google user
Simple strait forward way to predict Hs. Works great!