NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: George Brandenburg
Date: 2010 May 26, 15:12 -0700
I was browsing through the 1797 logbook of a local ship in our library today. This was my first attempt at doing this, and although I understood much of what I found I have a couple of questions.
On the left side of the page are three columns with hourly entries for H(our), K(nots), and F(???). Is the last entry fathoms? The numbers in this column ranged from 2 to 7, or were blank.
On the right side of the page is a column for what I think is magnetic variation, determined either by "Azimuth at 6 AM (or PM)", or by "Amplitude at Sun (circle with dot in center) Set". If there are three entries for a day they are in the order Azim at 6 PM, Amp at Sun Set, Azim at 6 AM. I can see how you could measure compass deviation by sighting along the compass and measuring the azimuthal angle to the setting sun, but I don't see how that matches up with these entries.
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