NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Using sun compass for calibrating boat compass
From: Greg Rudzinski
Date: 2014 Jun 20, 10:24 -0700
From: Greg Rudzinski
Date: 2014 Jun 20, 10:24 -0700
Bill,
Not sure what you have done. If near the prime vertical then the azimuth formula will give a more accurate result if LHA(t) for the assumed longitude is adjusted to the LOP EP longitude and Ho substituted for Hc. This would only be done when the calculated azimuth is needed to tenths of a degree. If making an observation exactly on the prime vertical then knowledge of exact latitude and declination is required for the formula sin Hc = sin d / sin L
http://fer3.com/arc/m2.aspx/Using-sun-compass-for-calibrating-boat-compass-BillB-jun-2014-g28091
