NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: How accurate are fixes in practice?
From: Jeremy C
Date: 2008 Jul 11, 23:52 EDT
In general, a merchant ship has from about 20-40 meters of height of eye from the bridge. On a 100 meter vessel, it is a bit lower, with most larger ships around 30 meters.
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From: Jeremy C
Date: 2008 Jul 11, 23:52 EDT
In general, a merchant ship has from about 20-40 meters of height of eye from the bridge. On a 100 meter vessel, it is a bit lower, with most larger ships around 30 meters.
My normal Celnav fixes are usually within 3 nm and I am disappointed by
worse results. Sunlines are usually within 1 nm when I use the GPS fix as
the AP, as are LAN observations.
I don't envy those who need to shoot from small vessels. I have never
done so, and can't say that I'd like to. My worse conditions are 20 degree
rolls with periods of 10-15 seconds. That can get irritating, but not
insurmountable.
Jeremy
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