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: Air vs. water: MOB and MOO table corrections in HO 249
    From: Mark Coady
    Date: 2016 Jan 8, 09:10 -0800

    Speaking of air vs water navigation and pre planned increments.....HO 249 contains correction tables for movement of observer and movement of body.

    If you are doing let's say a group of divergent star sights over a period of say five or ten minutes, which would give you crossing LOP's and thus a fix.  Does it make sense if you have HO 249 handy, to use the tables to adjust the three LOP's to the center sight time based on the "movement of body" table?  "Movement of observer" is probobly less a concern, due to relatively slow body speeds (at least my body is assummed to be on a slow boat).

    I've seen lots of triangulations done, but never saw noted the use of these tables in my reading on marine navigation.  I tend to be methodical and slow in shooting, hence three quick sights in succession might be longer for me than the more experienced or more adept navigators, and have a greater impact on crossing LOP's.


    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