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: History of HO249/AP3270
    From: David Pike
    Date: 2017 Aug 14, 23:47 -0700

    gl wrote: Here is the photo of the Kollsman periscopic sextant mount in one version of the Boeing 707. This particular airplane carried President Reagan all around the world. I wouldn't be at all surprised if the current presidental planes had these mounts. Can't be jammed like GPS and passive, no electronic emissions to attract attention.

    A presidential jet flying at the tropopause with a spare crew member might be one of the few places that 1970s style celestial would be worth pursuing as a loss of GNSS solution, because celestial would be available almost all the time.  However it would be a brave crew that descended towards high ground trusting only to a celestial fix.  It would get you to the correct country though.  There being no charge inside a hollow conductor, an existing sextant mount would have been a useful place to stick up an aerial for an early GPS set as was done in the RAF Dominies.  Moreover, it would be a great place to stick up the Stars and Stripes after landing. DaveP   

       
    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