NavList:

George, you asked:
"By the way, why is an exclamation mark used, where a decimal point is
appropriate? "

It's an old typographic trick. The exclamation mark in many fonts looks
like a combination of the punctuation for minutes of arc (a hash mark
or apostrophe) combined with a decimal. I don't use it anymore because
fonts are so variable.

And:
"I am puzzled about the reluctance to use the horizon for checking
index error."

I get excellent results from the horizon when I remove the telescope
from my sextant and shoot by eye only. I get less reliable results from
the horizon when using a medium power telescope. Lately, I get the most
believable results (apart from the table top technique) using limb-limb
sights with a nearly full moon in early twilight. But that's just for
lunars level accuracy. For most applications, the horizon technique is
more than adequate.

-FER


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