NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Bowditch (2002) Table 17
From: Bill B
Date: 2012 May 02, 01:34 -0400
From: Bill B
Date: 2012 May 02, 01:34 -0400
Gary I enjoyed the copy you sent, especially the method for removing possibly "fuzzy" IE's from the small angles often encountered with tables 15 through 17. IE problems are proportionally much larger than body with attitudes. Summary: Take an on-the-arc observation with the bottom through the horizon glass and the top reflected, then take an off-the-arc reading with the top through the glass and the bottom reflected. Average the two and voila, an angle not biased by any IE possible errors. Thanks Bill B On 5/1/2012 5:46 AM, Gary LaPook wrote: > Table 17 from the 2002 edition was also included in the 1938 edition as > table 11 and I have attached the explanation of its use from that > edition. It makes sense that this table had its main use for station > keeping in convoy, similar to the usage of the dip short of the horizon > table.