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    Re: CP-300/U Star Finder
    From: Fred Hebard
    Date: 2015 Mar 8, 23:35 -0400

    A somewhat off topic question, but is there any “history” associated with the 
    name of the 2102-D star finder?  Closer to topic, how about the name of the 
    CP-300/U Star Finder?
    
    Thanks,
    
    Fred Hebard
    mbiew@comcast.net
    
    
    
    > On Mar 8, 2015, at 8:46 PM, Brad Morris  wrote:
    > 
    > Hello Ed
    > 
    > I enjoyed your article and purchased one of these units off of eBay.  
    > 
    > I've been thinking about that (up to) 5° shift in the latitude for the azimuthal equidistant overlays. 
    > 
    > Consider a 10° latitude.  We can move the 5° overlay up to 10° or the 15° 
    latitude down to 10°.   But now consider, the 5° and the 15° overlays have 
    unique shapes so there must be some error associated with either when used at 
    10° latitude.
    > 
    > In order to determine this, I may have to resurrect the 2102e, so a 
    mathematical result can be obtained.
    > 
    > Alternatively, one could pull out two sequential overlays to the 2102d and directly observe the error.
    > 
    > I wonder if your research had led you down this path?
    > 
    > Brad
    > 
    > 
    > On Mar 7, 2015 4:02 PM, "Ed Popko"  wrote:
    > Marine navigators have used the 2102-D star finder for many years as an aid 
    to planning sights or identifying stars.  The U.S. Air Force developed a 
    variation in the mid-1950s called the CP-300/U that incorporated a number of 
    useful enhancements.
    > 
    > I wrote this article some years back for the “The Navigator’s Newsletter” 
    History of Navigation column (Issue #77  Fall 2002 pp.6-12) but no one seemes 
    to have ever heard of this device or know what it fate was. Perhaps someone 
    here has additional information.
    >  
    > 
    > Ed Popko
    > 
    > 
    > 
    > Attached File: 
    > 
    > (CP-300-U-for-frn-blog.pdf: Open and save or View online)
    > 
    > View and reply to this message
    > 
    > View and reply to this message
    > 
    
    

       
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