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
    or...
       
    Reply
    Re: Quartz article: reinstating celestial...
    From: Robert VanderPol II
    Date: 2015 Oct 23, 00:05 -0700

    Re: Quartz article: reinstating celestial...
    From: Lu Abel
    Date: 2015 Oct 22, 17:24 +0000

    As of right now, there are three different fully operational worldwide satellite navigation systems -- GPS, Glosnass, and Beidou.   Plus there are three others (Europe's not-quite-in-service) Galileo, and partial coverage systems fielded by Japan and India.  So if some hypothetical adversary "took out" GPS, there would still be several other systems from which positional information could be obtained.  
    I have no explicit knowledge of this, but it also seems to me that warships might have inertial navigation systems as backup to GPS.   US submarines stay underwater (and therefore out of GPS's reach) for long periods of time and it's claimed that their INS's are amazingly accurate.
    If GPS is taken out in wartime, the best bet is the other will be too.
    Alternatively all the systems could be disabled by a direct hit from a Coronal Mass Ejection (CME).
    I assume that the USN is also implimenting procedures for maintaining good time, i.e. multiple clocks and recording error rates.
    As far as intertial goes, the accuracy of the position degrades over time.  For a boomer sub if the error adds up to 5nm or more after 2,3,4 weeks, that's OK operationally, position is corrected when they come shallow to fire the missiles.  For other subs they are coming shallow more often. 
       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

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

    Email Settings

    Posting 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