NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Dip uncertainty
From: Alexandre Eremenko
Date: 2004 Dec 5, 19:25 -0500
From: Alexandre Eremenko
Date: 2004 Dec 5, 19:25 -0500
This is strange and seems to contradict another rule that "dip due to refraction is about 1/12 of the geometric dip". Maybe the sort of uncertainty you are talking about is due to the waves? It seems that under the ideal conditions (no waves) the dip and the error in the dip should be smaller as you come closer to water. The Russian manual I read long ago, which worries a lot about dip, recommends observations from LOWER positions on a large ship. Alex. On Sun, 5 Dec 2004, Bruce Stark wrote: > One aspect of the uncertainty of dip that I don't think has been discussed on > the List is that it gets worse fast as your eye gets nearer the water. That > is, it's much more a problem for small boat navigators than for ship's > officers. > > Bruce >
