NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: A12 vs A8-A sextants
From: Paul Hirose
Date: 2020 Apr 27, 10:21 -0700
From: Paul Hirose
Date: 2020 Apr 27, 10:21 -0700
On 2020-04-25 12:00, Geoffrey Kolbe wrote:
> the bubble image is sharp and clear on the A8-A and there are a couple of
vertical tramlines up through the bubble chamber to help you centre the image
and bubble in the bubble chamber
US Air Force Manual 51-40 ("Air Navigation") says best accuracy is
achieved when the bubble and body are near the vertical centerline.
Error increases as you depart from that line even if the sight picture
looks good.
http://sofajpl.com/airnav/index.html#COLLIMATIO
