A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2018 Apr 13, 13:07 -0700
Rafal you wrote: The original Pub 249 Vol 1 might be not sufficient for this case as its accuracy is limited to [1' in Hc] and 1° in Zn. I used the original Pub 249 Vol 1 data and created its more accurate version: [0.1' and] 0.1°.
I think it all depends upon the accuracy of your inputs, and what you’re intending to do with your outputs once you got them. If working on a small scale paper chart, how accurately can you plot your assumed position, how accurately can you plot your azimuths with a Douglas Protractor and a 2B pencil, how accurately can you pick off your intercepts with your dividers and apply them to the chart? If you can’t do this to better than the nearest nautical mile or degree, are tables to 0.1 minute of arc and 0.1 degree going to be of any additional value to you? If on the other hand you’re working from a steady platform with a good quality marine sextant and looking for a computer solution, then perhaps it’s worth it, but in that case, do you need the tables at all? Can’t the information you need all be within the computer programme almanac? DaveP