Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    Name or NavList Code:
    Email:
       
    Reply
    Re: Time and cel nav, a stupid question
    From: Fred Hebard
    Date: 2008 Apr 22, 12:54 -0400

    I followed up on this when it was mentioned previously on this list,
    and I believe the accuracy of cell phones may vary with the network.
    I'm on AT&T, and my impression is that the time is not accurate.  For
    instance, my phone now says it's 9:51:55 and my computer says it's
    12:52:42.  The computer is getting its time from a network time
    server.  These may be more accurate than the USNO site, but, I don't
    know this one way or another.
    
    Fred Hebard
    
    On Apr 22, 2008, at 11:56 AM, Lu Abel wrote:
    
    >
    > Bill:
    >
    > The time difference between your Garmin and the USNO web site is
    > likely
    > due to network delays (ie, the USNO sends you a time pulse at the
    > correct time, but it takes almost a second to arrive at your
    > computer).   The other web site run by USNO, www.time.gov, says it
    > attempts to measure network delays and compensate for them.   Another
    > source for accurate time is your cell phone.  Mine only keeps time to
    > the minute, but it very accurately rolls over at the 60-second mark.
    >
    > Lu Abel
    >
    > Bill wrote:
    >> The current discussion on time, relativity and leap seconds is, in
    >> many
    >> areas, well above my head.  Noting the various flavors of UT
    >> (currently), an
    >> observation and a pragmatic question for cel nav.
    >>
    >> The seconds readout between my GPS (Garmin GPS 76) and
    >> http://tycho.usno.navy.mil/cgi-bin/anim
    >> differ by about one (1) second.
    >>
    >> The web site (dial up modem at the moment) is nominally one (1)
    >> second
    >> behind the GPS readout.
    >>
    >> Bringing it into the realm of traditional navigation, which time
    >> do I use to
    >> set my hack watch? ;-)  Potentially a quarter mile intercept
    >> difference
    >> under ideal circumstances.
    >>
    >> I do not have access to a time-signal radio now.
    >>
    >> Bill
    >>
    >>
    >>>
    >>
    >
    > >
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    NavList ID Code:

    Custom Index

    Subject:
    Author:
    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