NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Azimuth Formula Questions
From: Dan Hogan
Date: 2005 Nov 2, 14:23 -0800
From: Dan Hogan
Date: 2005 Nov 2, 14:23 -0800
HO 208 divides the navigational triangle MPZ into two angles by droping a perpendicular ZD from the observers Zenith upon the circle of declenation. Called "a". From H.O. 208, Fifth Edition, 1935 Price listed as $1.20 Dan Hogan dhhogan1@earthlink.net > [Original Message] > From: Bill> To: > Date: 11/2/2005 12:47:39 PM > Subject: Re: Azimuth Formula Questions > > Doug wrote> > > > Both systems(208 + 211)are > > based to reduce sights by using t(MA)instead of the way the newer tabulation > > methods,except HO-214,are formatted. What is really nice about the HO-211 > > system is a person only needs the HO-211 data book (35 pgs) and a NA to > > reduce sights from any band of latitude. One can forget about carrying all > > the volumes of the newer systems onboard. And both are just as "accurate" as > > are the newer tabulation methods of sight reduction "in the real world". > > Thank you all. > > If I understand, HO211 divides the triangle into 2 right triangles. Is that > the case with 208 as well? > > My regular cruising waters are the Great Lakes. Because of the proximity of > shores, light pollution from Chicago etc., my initial choice was 229 over > 249 as 229 appeared to offer more choice in body selection. There certainly > is a case to me made for one small volume. My cruising grounds (Great > Lakes) require two 229 volumes. Head south and I need a bookmobile to lug > them all;-) > > With Lake Michigan boats now on the hard, and dinghy sailing/racing about > done for the season, I hope to learn more about 208/211 when the snow flies. > > Bill