A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Francis Upchurch
Date: 2014 Aug 13, 21:41 -0700
Looks good Greg. My little waterproof plastic box contains Davis Mk1 with EoT and Dec table. Marker pen for writing down results on the box. I wear a Rotary mechanical watch(about $100 5 years ago. Chinese build, transparent "Georgian" chronometer looks that I hope Harrison would have liked) automatic watch which keeps remarkably constant going rate of about -25 secs per day. if I wear it most of the time. Recently added my Otis King slide rule + 1 page sin/cos table. Can now do the cos formula for LOP and Az. What do you use for a watch? Is a digital watch "electronic" and therefore "cheating"? (I admit to having a cheap $5 casio waterproof in there, plus calculator in plastic bag, just in case. But do not use them, honest!). I'm eventually going to do an updated one page permanent almanac, but not difficult to work out GHA from EoT. Must keep log of accurate date to get watch error and GHA though. I've also copied you and added the Doniol sight reduction using compact trig tables, Ix azimuth diagram.Also small charts of my sailing area.