Does anyone know what this is

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not entirely sure how it works, but it brought up something almost identical, click a few links and see more about it and ended up with the above link

 
At a rough guess it can also calculate latitude. A rather fancy sextant.


It's not like any sextant I have seen as it doesn't have a 'viewfinder' 

I noticed whilst looking at it that there's a small piece broken. Been looking to try an find photos of where it goes which I seem to have found. Will start the search for instructions of use later tonight, more for curiosity than anything. 

 
I see that the sun's shadow bit is lined up with noon  , guessing thats when they took a sighting ....other than that ... :C   Obviously a navigation instrument .

Some of those things were really clever .

I remember something about it being relatively easy to plot latitude but not longitude   ...or the other way around.   The other main problem was not having an accurate timepiece.

 
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