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Lu:

Re the comparative material, comparing the Davis Mk 15 with the MK 25, I believe I've heard this too. Like you though, I cannot substiantiate it either.

As to moving things "in the same direction", I think I saw that suggested, even with "top quality" metal sextants. I have a Davis Mk. 15, which I bought second hand on Ebay several years ago, and an Astra 111B, purchased new. I don't know if this last would be considered "top quality", though I understand it's a "professional quality instrument", whatever that might mean. They use them at Kings Point, I think.

In any event, as memory serves, shooting from the beach at Emerald Isle, North Carolina, the results I got with the Astra and the Davis were NOT wildly different.

I did note that index errors with the Davis seemed to wander a whole lot more than with the Astra. An old saying ran to the effect that "you get what you pay for", though sometimes what you paid for isn't quite what you got, or you just pay.

Alan
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