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
    A further reason for traditional Navigation - GPS interference
    From: Aubrey O?Callaghan
    Date: 2003 Jan 5, 14:58 -0400

    I came across an article today about GPS interference.
    Another reason that traditional navigation paper charts, plotting DR
    positions etc. are important.
    Earlier we had some discussion of the US Navy going to solely electronic
    charts, what if the GPS puts one in the wrong position, where does DR get
    cross checked with electronic position ?
    Will the US Navy ban watching television while underway ?  ! :-)
    "FAULTY GPS? CHECK THE TV AERIAL! THE next time a ship runs onto the
    Tricolor wreck it may worth checking whether anybody was watching
    television at the time. US Coast Guard is warning that certain marine
    television  antennas may interfere with the performance of Global
    Positioning System receivers. It says: "The interference can result in
    inaccurate position information or a complete loss of GPS signals.  This is
    a potential hazard to navigation, for both the operator of the vessel with
    the television antenna and for nearby boaters as the interference is not
    limited to the GPS equipment onboard the vessel with the antenna. In some
    cases, vessels up to 2,000 feet away from an active antenna have reported
    The Federal Communications Commission identified the following models of
    antennas as having potential problems during investigations of GPS
    interference: TDP (Tandy Distribution Products) Electronics - MINI STATE
    Electronic Amplified UHF/VHF TV Antenna - Models 5MS740, 5MS750, 5MS921
    Radio Shack Corporation - Long Range Amplified Omni Directional TV Antenna
    - Model 15-1624 Shakespeare Corporation - SeaWatch - Models 2040 (Code date
    02A00), 2050 (Code date 03A00). "

    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