NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Change in Altitude Tables
From: Bill Noyce
Date: 2004 Mar 29, 12:04 -0500
From: Bill Noyce
Date: 2004 Mar 29, 12:04 -0500
> AP 3270, the British equivalent to HO 249 has a set of tables called > "Altitude Corrections for Change in Positon of Observer". The entry > arguments are ground speed in knots and relative bearing of the observed > body. It's a neat little table except it is of no use for marine > applications because the lowest speed given is 50 knots. > > Robert If you look closely at the table, you'll see the entries in any row are directly proportional to the speed (though the rounding to whole minutes obscures this slightly). Thus, you can simply divide both the speed and the correction by some convenient factor (ten?) for use on a boat. In other words, you can pencil in decimal points in the speed headings and the table entries in the top table. -- Bill