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
    Re: GPS System failure
    From: Greg R_
    Date: 2014 Jun 22, 18:31 -0700
    I setup a waypoint ("J") based on your lat/long, and created a flight plan from Tel Aviv (LLBG) to that waypoint. I then ran that flight plan through Garmin's FDE (Fault Detection and Exclusion) program with an up to date almanac and an ETA at J of 1800Z on 06/14/2014.
    According to those results (see attachments), the GPS availability was OK for IFR (Instrument Flight Rules) at the time (and for all currently available options of varying precision for approach and landing). And that would seem to imply that it was also good for marine navigation (especially since aviation use requires 1 additional working satellite for 3D navigation). Though I'm not sure that this is a valid apples-to-apples comparison, you might want to search online to see if there were any GPS advisories in effect at the time for marine use.
    Is it possible that all 3 antennas were obstructed at the time (i.e. someone working or lazing in the vicinity at the time)? I'd ask what you saw on the satellites page of the GPSes, but think you said that you weren't able to get that at the time.

    On 6/18/2014 6:21:06 AM, Jeremy C (noreply_jeremyc@fer3.com) wrote:

    > Greg,
    > Time was approximately 1800Z (2100 local) on 14 June.  Lat 31-
    > 49'N Long 34-37'E  I am not sure if Ashdod, Israel has an airport, but Tel
    > Aviv airport isn't too far away.
    > Thanks for the information.  I didn't
    > know about that.  I
    > didn't get any broadcasts about known outages and didn't look at the birds
    > from the GNSS as I was trying to get the alarms to stop.  I will have to
    > keep an eye out for similar problems.
    > Jeremy
    > View and reply to this message [link: 'http://fer3.com/arc/m2.aspx/GPS-System-failure-JeremyC-jun-2014-g28079']



    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