NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Navigating Around Hills and Dips in the Ocean
From: Richard M Pisko
Date: 2003 Aug 16, 23:07 -0600
From: Richard M Pisko
Date: 2003 Aug 16, 23:07 -0600
On Sat, 16 Aug 2003 11:11:42 -0300, Trevor J. Kenchington wrote: >While I agree with George that there would be no virtue in routing ships >around the hills and valleys created by gravity anomalies, in order to >save the energy cost of climbing the hill, ... there should be no energy expended following the equipotential surface at all ... >there _might_ be some benefit >in avoiding these other types of hills. < ... and the hull would sink deeper into the fresher water, which would change the flow characteristics even if the displaced water is of the same mass ... >I would suspect that it is at >most a minor consideration in vessel routing (avoiding of benefiting >from the Gulf Stream current would be of far greater concern than its >effect on elevation) but perhaps somebody takes it into account. > I think you hit on an important factor there, with the Gulf Stream current; and perhaps the expected wind patterns. But again, except for the displacement of a plumb line (or rather, a theodolite level vial bubble) near a mountain range, this is all theory to me. -- Richard ...