Now if you are depending on me to "do the maths" please expect another "Flight 19" type outcome, eg getting lost. I can't give a sensible or reasonable answer but I find these things and charts interesting getting out and back being so important. I guess one has to respect the ability of those who could use these tools and get their colleagues "there and back" safely. Sextant complete in its case wit "the extras".
Another simpler device would love the compass to set these on but where to find and the transit implications.
A calculator used in celestial navigation. I found this in a collector s fair in Normandy last year, buying it then would have cleaned me out so I contacted the vendor on my return home and bought it then. A crack in the top cap otherwise in good order, used post-war by the French Navy it came with instructions in French. I would love a star globe to go with this but so very rare and darned expensive.
some information on this device from Eduardo Delgrado's excellent work on Kriegsmarine Collectibles which he has in his fine collection. Eduardo is "one of the good guys".
Very nice. Got the modern version of the star scope, daughter gave me it for Christmas a while back. Look through the eyepiece and it lights when it detects each constellation.
