---
title: "GPS Anti Spoof Pro - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Instantly compare observed celestial navigation altitudes with high precision, live calculated altitudes. Shoot the Sun, tap pause in the app, and get instant feedback.  Standard version includes data"
---

# GPS Anti Spoof Pro — United States
> sextant sight analyzer

![GPS Anti Spoof Pro App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ac/fa/b4/acfab421-9c3f-cc94-bcec-8f56f3997e4c/AppIcon-0-0-1x_U007emarketing-0-8-85-220.png/434x0w.png)

**Developer:** [Frank Reed](https://apptail.io/developer/frank-reed-XJHb)
**Category:** Navigation
**Rating:** 5.0/5 (7 ratings)
**Price:** $19.99
**Bundle ID:** com.clockwk.GPS-Anti-Spoof-Pro
**Store:** Apple App Store
**Country:** United States
**Version:** 1.40 (released 2026-06-04)
**Original Release:** 2019-06-11
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1379926231)
**AppTail Page:** [https://apptail.io/app/gps-anti-spoof-pro-hWSd/united-states](https://apptail.io/app/gps-anti-spoof-pro-hWSd/united-states)

## GPS Anti Spoof Pro Description
Instantly compare observed celestial navigation altitudes with high precision, live calculated altitudes. Shoot the Sun, tap pause in the app, and get instant feedback.

Standard version includes data for the Sun, Venus, and two stars. The Pro version of the app is for serious navigation use and includes data for the Sun, Moon, Venus, Mars, Jupiter, Saturn, the 57 standard navigational stars, plus Polaris. Both versions function off-network and at sea however the standard version only works for ten days off-network. The Pro version can function for weeks in the middle of the ocean without network access.

This app calculates the exact sextant altitude that should be observed in celestial navigation at sea or on land 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. If the GPS position is wrong, due to Spoofing at sea, observations will not match. With this app and occasional quick sextant sights, mariners can reliably detect GPS spoofing.

No GPS Spoofing? The app also functions as a celestial navigation trainer: take a sextant sight and immediately compare against the app's display. No paperwork and instant feedback will improve celestial sextant skills in hours instead of days or weeks. 

The app works off-network, even in the middle of the ocean. If a network connection is available, the app will download temperature and pressure information automatically. Or weather data can be entered manually, if desired.

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 altitudes are accurate to a tenth of a minute of arc.

## GPS Anti Spoof Pro Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/fc/c0/44/fcc04419-8ae1-2cc0-36d3-3e0182819d7f/pr_source.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/13/6a/2a/136a2a41-bd62-baaa-4f03-039d9cb2e8a9/pr_source.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/11/dc/00/11dc00fa-c62e-aa94-e8b2-3d0da4645259/pr_source.png/1242x2688.png)

## GPS Anti Spoof Pro Rating Breakdown in United States
- 5 stars: 7 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)

## GPS Anti Spoof Pro Reviews in United States

### ***** "Delivers on claims!"
Frank is a genius for developing this app. I’m a novice so checking my sights against the app is a godsend!  Also, doesn’t collect any data from my phone or the app. Appreciate the privacy.  I do wish I could turn off all features which use internet connectivity when present.
-- Jib Sheet, 2025-04-20

### ***** "Works as Advertised!!"
This app is fantastic for checking your GPS. 
Excellent for educational purposes to check celestial sights. 
I highly recommend this app.
-- CGrosby, 2024-09-20

[View all GPS Anti Spoof Pro reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)


## GPS Anti Spoof Pro Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Portugal | Navigation | #229 |


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## GPS Anti Spoof Pro Available In
- [United States](https://apptail.io/app/gps-anti-spoof-pro-hWSd/united-states)
- [United Kingdom](https://apptail.io/app/gps-anti-spoof-pro-hWSd/united-kingdom)
- [Sweden](https://apptail.io/app/gps-anti-spoof-pro-hWSd/sweden)
- [Japan](https://apptail.io/app/gps-anti-spoof-pro-hWSd/japan)
- [Belgium](https://apptail.io/app/gps-anti-spoof-pro-hWSd/belgium)
- [Azerbaijan](https://apptail.io/app/gps-anti-spoof-pro-hWSd/azerbaijan)
- [Canada](https://apptail.io/app/gps-anti-spoof-pro-hWSd/canada)
- [Switzerland](https://apptail.io/app/gps-anti-spoof-pro-hWSd/switzerland)
- [China](https://apptail.io/app/gps-anti-spoof-pro-hWSd/china)
- [Colombia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/colombia)
- [Cyprus](https://apptail.io/app/gps-anti-spoof-pro-hWSd/cyprus)
- [Czechia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/czechia)
- [Germany](https://apptail.io/app/gps-anti-spoof-pro-hWSd/germany)
- [Dominican Republic](https://apptail.io/app/gps-anti-spoof-pro-hWSd/dominican-republic)
- [Spain](https://apptail.io/app/gps-anti-spoof-pro-hWSd/spain)
- [Finland](https://apptail.io/app/gps-anti-spoof-pro-hWSd/finland)
- [France](https://apptail.io/app/gps-anti-spoof-pro-hWSd/france)
- [Greece](https://apptail.io/app/gps-anti-spoof-pro-hWSd/greece)
- [Hong Kong SAR China](https://apptail.io/app/gps-anti-spoof-pro-hWSd/hong-kong)
- [Croatia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/croatia)
- [Hungary](https://apptail.io/app/gps-anti-spoof-pro-hWSd/hungary)
- [Indonesia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/indonesia)
- [Ireland](https://apptail.io/app/gps-anti-spoof-pro-hWSd/ireland)
- [India](https://apptail.io/app/gps-anti-spoof-pro-hWSd/india)
- [Italy](https://apptail.io/app/gps-anti-spoof-pro-hWSd/italy)
- [South Korea](https://apptail.io/app/gps-anti-spoof-pro-hWSd/south-korea)
- [Kuwait](https://apptail.io/app/gps-anti-spoof-pro-hWSd/kuwait)
- [Lebanon](https://apptail.io/app/gps-anti-spoof-pro-hWSd/lebanon)
- [Mexico](https://apptail.io/app/gps-anti-spoof-pro-hWSd/mexico)
- [Nigeria](https://apptail.io/app/gps-anti-spoof-pro-hWSd/nigeria)
- [Netherlands](https://apptail.io/app/gps-anti-spoof-pro-hWSd/netherlands)
- [Norway](https://apptail.io/app/gps-anti-spoof-pro-hWSd/norway)
- [New Zealand](https://apptail.io/app/gps-anti-spoof-pro-hWSd/new-zealand)
- [Peru](https://apptail.io/app/gps-anti-spoof-pro-hWSd/peru)
- [Philippines](https://apptail.io/app/gps-anti-spoof-pro-hWSd/philippines)
- [Poland](https://apptail.io/app/gps-anti-spoof-pro-hWSd/poland)
- [Romania](https://apptail.io/app/gps-anti-spoof-pro-hWSd/romania)
- [Russia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/russia)
- [United Arab Emirates](https://apptail.io/app/gps-anti-spoof-pro-hWSd/united-arab-emirates)
- [Thailand](https://apptail.io/app/gps-anti-spoof-pro-hWSd/thailand)
- [Taiwan](https://apptail.io/app/gps-anti-spoof-pro-hWSd/taiwan)
- [Ukraine](https://apptail.io/app/gps-anti-spoof-pro-hWSd/ukraine)
- [Saudi Arabia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/saudi-arabia)
- [Armenia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/armenia)
- [Argentina](https://apptail.io/app/gps-anti-spoof-pro-hWSd/argentina)
- [Austria](https://apptail.io/app/gps-anti-spoof-pro-hWSd/austria)
- [Australia](https://apptail.io/app/gps-anti-spoof-pro-hWSd/australia)

---

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