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
    Name or NavList Code:
    Re: GPS Interference
    From: Gary LaPook
    Date: 2011 Oct 18, 22:33 -0700
    From Ocean Navigator Magazine:

    "GPS interference?
    Lately a coalition of GPS companies and user groups called Coalition to Save Our GPS (CSOG) has formed to protect GPS signals from the possibility of interference from a wireless Internet access firm called LightSquared. The wireless firm has plans to deploy a reported 40,000 ground stations that will transmit on a frequency adjacent to that used by GPS. According to CSOG, the LightSquared signals will be “one billion times more powerful than GPS signals as received on Earth.”

    The fear for marine GPS users is that the LightSquared service will interfere with GPS signals in harbor or coastal situations. Offshore, there will be no LightSquared stations within range. But it’s the harbor and coastal situations where you want the best GPS coverage since that’s where the hard stuff tends to be located.

    Some members of CSOG include: Garmin, Trimble, the International Air Transport Association, the Aircraft Owners and Pilots Association, Caterpillar Diesel, and a host more.

    CSOG states emphatically that the LightSquared system represents a great potential danger to GPS, but so far, this conclusion is based on preliminary lab testing. More real world testing is clearly needed before the LightSquared system should be allowed to go forward. That seems prudent to avoid the possibility of 40,000 coverage holes, one of which just may include your harbor or favorite stretch of coast."


    --- On Thu, 9/29/11, Gary LaPook <glapook@pacbell.net> wrote:

    From: Gary LaPook <glapook@pacbell.net>
    Subject: [NavList] Re: GPS Interference
    To: NavList@fer3.com
    Date: Thursday, September 29, 2011, 10:31 AM

    But we need accurate GPS coordinates so that we can check the accuracy of our practice CN shots.


    --- On Thu, 9/29/11, Frank Reed <FrankReed@HistoricalAtlas.com> wrote:

    From: Frank Reed <FrankReed@HistoricalAtlas.com>
    Subject: [NavList] Re: GPS Interference
    To: NavList@fer3.com
    Date: Thursday, September 29, 2011, 5:43 AM


    All of this is tainted by politics. Not to say that the AOPA letter isn't honest and genuine, but since the Obama Administration has made itself the "we love trains, we hate planes" Oval Office (and really it's the President himself who has this prejudice), it's tough to separate general aviation's general angst from independent engineering analysis. I notice that the aviation industry's long-standing newspaper of record, "Aviation Week & Space Technology," has been much more circumspect in their concerns over LightSquared, at least AFTER LightSquared agreed to abandon the frequency band closest to GPS frequencies.

    By the way, this is the first time in my experience following NavList messages that a threat to GPS has not been celebrated as a window of opportunity for celestial navigation experts. But times change! :)


    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com

    Browse Files

    Drop Files


    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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