NavList:

Bill,

> OK, I'll take the bait.  First a question.  What is the smallest marked
> increment of measurement on your SNO-T?

I was talking of PRACTICAL readability of the scales.
The constructions of the drum and ordinary vernier scales
are very different, and it is not the "smallest divisions"
which have to be compared but the "smallest difference you can
actually see".

The smallest difference I can actually see on the SNO scale
is about 0.1'. By this I mean that I can read with at most 0.1
error most of the time, probably 95 percent of the time.
On  the pocket sextant I can see the difference of 1'
about 90 percent of the time. It requires more time and effort
than to see the difference of 0.1' on SNO. In some
cases I cannot tell
for sure whether this is 2' or 3'. In these cases I write
2.5'. You may call this "interpolation".

> The current message was posted on NavList.

Sorry, I do not read posted messages since we switched to
NavList. (This was the main reason why I resisted the move).
I only read e-mails. So when I want to reply an e-mail
that I read yesterday, I have to rely on my memory, which is
not very reliable:-(

> My real concern is that I undershoot 4SD perhaps 95% of the time.

By how much do you usually overshoot 4SD?

Alex.


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