NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Bubble Sextants
From: Gary LaPook
Date: 2008 Dec 16, 11:23 -0800
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From: Gary LaPook
Date: 2008 Dec 16, 11:23 -0800
Ken, I hate to disagree with you but I have taken many shots in small planes being hand flown solo without an autopilot using the technique that you described. Trim the plane, put it on heading, put sextant to eye, center star in bubble, put sextant down and then turn the plane back onto heading since it invariably wandered off heading while looking thru the sextant. This would cause a "wander error" since the heading was changing at the moment of colimation and this wander error was of an unknown amount and of a scale larger than the normal wander error contemplated in the navigation manuals because it is caused by the rate of heading change at that moment. Using the averager, even with half of the A-10A disk covered with marks, produced good shots. gl --- On Tue, 12/16/08, Ken Gebhart <GEBHART@CELESTAIRE.COM> wrote: From: Ken Gebhart <GEBHART@CELESTAIRE.COM> |
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