NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Eno
Date: 2015 Nov 20, 13:39 -0700
I will wade in here and tell you that in my experience, the whole-horizon mirror really comes into its own for artificial horizon observations; both bubble and reflective glass.
Robert
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Greg Rudzinski
Sent: November-20-15 1:11 PM
To: enoid@northwestel.net
Subject: [NavList] Re: Whole Horizon Mirror vs. Split Horizon Mirror
Dave,
There is a loss of contrast between the reflected horizon and the direct horizon when lining up the horizons on the whole horizon mirror. On horizontal angles the overlapping features get blended making identification hard. The split mirror can be cocked up a hair to have the nav aids one above the other to positively identify then overlapped for precision. Since I have both types of horizon mirrors on different sextants it is easier to compare the subtle differences on the spot.
Greg Rudzinski
From: David Fleming
Date: 2015 Nov 20, 10:01 -0800Greg,
Could you explain:
The down side is that checking index error by horizon alignment is made difficult as are horizontal sextant angles.
Thanks,
Dave
