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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)
> 
> 
> 
> 
> 

   

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