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Subject: RE: [Fwd: [Fwd: [Nml] Davis Sextants]]
From: Rick Emerson (rick@XXX.XXX)
Date: Tue Jan 26 1999 - 07:22:20 EST
captainmike7@XXX.XXX writes:
> I have not subjected my Davis Mk 25 to any scientific tests but, as stated
> previously, from an exactly known location I have taken many sights over
> the years with intercepts of 0-1 nm and dozens under 3 nm (the requirement
> for Power Squadron exactly-known-position sights). I have had none of the
> maintenance or adjustment problems mentioned by others (Davis Mk 25 circa
> 1983).
[...]
"The proof of the pudding is in the eating" and I think the above
adequately demonstrates that it is possible to get meaningful results
from "a plastic sextant". I want to be clear on this point because
there have been commentators elsewhere who argue that sextants made
from plastic, a priori, cannot give good results.
It is my contention that a number of factors make getting these
results more difficult than with metal-framed sextants such as (but
hardly limited to) Astras.
On class of sextants that I haven't worked with are the 7/8 size
sextants. Aside from taking up less space in the cabin, what
advantage, if any do they offer? Also, it seems the shorter index arm
makes accuracy even more problematic.
Rick
S/V One With The Wind, Baba 35
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