Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    GPS Anti Spoof app
    From: Frank Reed
    Date: 2017 Dec 3, 07:28 -0800

    My "GPS Anti Spoof" app is out in a new version on the Android app store (Google Play Store). Function is simple. The app does everything. All you do is shoot the Sun (or Moon, planet, star) with your sextant and directly compare with the displayed altitude in the app. No calculations / no paperwork. It's great for sextant training --you get instant feedback. And it easily detects GPS spoofing, if you're worried about pirates and that sort of thing! Naturally it can only detect spoofing or other errors in your GPS position (e.g. from operator error) within the limits of celestial sights, which means no better than about one nautical mile and a single sight can only detect a shift along the same axis as the azimuth of the body you're shooting. Unlike nearly all other available apps and software, this app also incorporates the deflection of the vertical, which caan throw off your sights by more than one minute of arc near many islands. The app is dead-on accurate. Here's the link in the store: https://play.google.com/store/apps/details?id=com.clockwk.GPSAntiSpoof. The basic version is free. There's also a paid "pro" version which you can find on your own. 

    And, yes, the iOS version is on the way. The Apple approval process is notoriously slow, but that's how they keep the world safe from security threats, right?

    Here's the pdf of my Navigation Symposium presentation on this concept:

    Frank Reed
    Clockwork Mapping / ReedNavigation.com
    Conanicut Island USA

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site