# GPS Anti Spoof Pro vs Celestial Navigation

The clearest difference is price: Celestial Navigation at $1.99 against GPS Anti Spoof Pro's $19.99. Celestial Navigation also leads on update cadence (every 5 days vs every 5 months) and chart position (#74 vs unranked). GPS Anti Spoof Pro's advantage is rating (5.0 vs 4.2) and review sentiment (100% vs 77%). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

GPS Anti Spoof Pro costs $19.99 and Celestial Navigation $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GPS Anti Spoof Pro holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 7 and 15 respectively. Written reviews point the same way: 100% of GPS Anti Spoof Pro's written reviews are positive against 77% of Celestial Navigation's.

GPS Anti Spoof Pro ships an update every 5 months, Celestial Navigation every 5 days. The most recent releases landed on October 7, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | GPS Anti Spoof Pro | Celestial Navigation |
| --- | --- | --- |
| Price | $19.99 | **$1.99** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/gps-anti-spoof-pro/id1379926231/reviews)** | [4.2 (15 ratings)](https://appshunter.io/ios/app/celestial-navigation/id1458513224/reviews) |
| Number of ratings | 7 | **15** |
| Positive reviews | **100.0% of reviews** | 77.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 5 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#74** |
| Size | 12 MB | 51 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Frank Reed](https://appshunter.io/developer/1379926230) | [Dr. Harald Merkel](https://appshunter.io/developer/404381431) |

## What reviewers say

### GPS Anti Spoof Pro

[App page](https://appshunter.io/ios/app/gps-anti-spoof-pro/id1379926231)

Instantly compare observed celestial navigation altitudes with calculated ones. This app helps mariners detect GPS spoofing and functions as a celestial navigation trainer. It automatically includes all necessary corrections for accurate readings.

**Highlights:** Celestial altitude comparison, GPS spoofing detection, Celestial navigation trainer, Automatic correction calculations, Offline functionality, Sun, Moon, planet, and star data

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Celestial Navigation

[App page](https://appshunter.io/ios/app/celestial-navigation/id1458513224)

**Currently charting:** #74 Top Paid · Navigation (US App Store)

This application assists with celestial navigation by performing sextant sight reduction calculations. It displays intermediate numbers for verification and can draw lines of position on a map. Features include a perpetual nautical almanac and a star finder to identify celestial bodies.

**Highlights:** Sextant sight reduction calculations, Perpetual nautical almanac, Line of position calculation and plotting, Star Finder for celestial identification, Save and manage sextant readings, Display intermediate calculation numbers

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GPS Anti Spoof Pro free?

GPS Anti Spoof Pro costs $19.99, with no in-app purchases.

### Is Celestial Navigation free?

Celestial Navigation costs $1.99, with no in-app purchases.

### Which has better reviews, GPS Anti Spoof Pro or Celestial Navigation?

GPS Anti Spoof Pro is rated higher. GPS Anti Spoof Pro averages 5.0 out of 5 from 7 ratings, while Celestial Navigation averages 4.2 from 15 ratings.

### Do GPS Anti Spoof Pro or Celestial Navigation have ads?

Neither GPS Anti Spoof Pro nor Celestial Navigation shows ads.

### Which is updated more often, GPS Anti Spoof Pro or Celestial Navigation?

GPS Anti Spoof Pro ships an update every 5 months, and Celestial Navigation every 5 days. Most recently, GPS Anti Spoof Pro was updated on October 7, 2026 and Celestial Navigation on October 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*