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    Re: New compact backup CELNAV system
    From: Gary LaPook
    Date: 2009 Feb 25, 13:39 -0800
    I haven't seen the problem you mentioned. I sealed the Cotangent scale in normal plastic protection sheets (about one buck each at Fryes) used for protecting documents which are quite rigid. I will experiment with bending the scale and working a sample problem and get back to you.


    --- On Wed, 2/25/09, nsg21@hotmail.com <nsg21@hotmail.com> wrote:
    From: nsg21@hotmail.com <nsg21@hotmail.com>
    Subject: [NavList 7427] Re: New compact backup CELNAV system
    To: NavList@fer3.com
    Date: Wednesday, February 25, 2009, 9:47 AM

    I would like to share some experience in using this (transparency over printed)
    style of the slide rule. The surface it is placed for calculation MUST BE
    ABSOLUTELY flat. Even small warping of the surface (such as normally found on
    small plastic tables) leads to big errors in calculations.

    From: glapook---NET
    Date: Tues, Feb 24 2009 12:06 pm
    > There are often posts on the Navlist regarding using celestial as a backup
    > GPS and finding a simple way to do this. I think I have found a method
    > is simple, self contained, takes up little space, needs no almanac or
    > reduction tables

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