NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Slide Rule vs HO229 and 249 Interpolation Tables
From: Mike Burkes
Date: 2003 Jun 1, 13:05 -0700
From: Mike Burkes
Date: 2003 Jun 1, 13:05 -0700
Hi folks and thanks for reading. I have a subject that I have been wanting to post for some time and it may be old stuff for some of you but I have not seen a formal discussion on it. Simply it involves the use of a slide rule or it's nautical and aviation equivalents the Nautical Slide Rule and E6b computer respectively to determine the "d" correction from HO 229 and 249 added to tabulated altitude Ht to get Hc. The setup is d value over 60 = d correction over declination minutes. It works great for me eliminating double second differences, page turning, i.e. very convenient and efficient. Of course an electronic calculator can directly solve for d correction but the whiz wheels are truly non electronic and a" flick of the thumb" is all it takes as a number of you are well aware! Would love to hear comments,criticisms,etc. Thanks! Yours Truly, Mike Burkes. _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
