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: Longitude shift on NOAA charts vs. Google Earth
    From: Gary LaPook
    Date: 2012 Aug 14, 10:33 -0700
    The datum of your chart is most likely NAD 27 (North American Datum of 1927) and Google Earth uses a different datum, WGS 84.

    gl

    --- On Tue, 8/14/12, G Becker <george@gwbeckerpls.com> wrote:

    From: G Becker <george@gwbeckerpls.com>
    Subject: [NavList] Longitude shift on NOAA charts vs. Google Earth
    To: NavList@fer3.com
    Date: Tuesday, August 14, 2012, 8:37 AM

    Sorry if this has been covered before.. On my office wall I have an older NOAA chart (1979). I mark the Lat/Long of various sites on the chart using data from Google Earth. The marks are made in alignment with the NOAA chart scales found around the border. Comparing the two versions of Lat/Long, Google's data is always shifted approximately 1/4 Nautical mile toward Greenwich. Latitude is always accurate. If my data is not incorrect, what would be the difference in the two Lat/Long systems?
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    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