
NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: DR thread from Nov-Dec '04
From: Bill B
Date: 2005 Jan 20, 00:05 -0500
From: Bill B
Date: 2005 Jan 20, 00:05 -0500
> < If you are on a watercraft half way between,> > You're not disagreeing with me, you may have just failed to note that I > pointed out the fetch is 4000 miles--to the Califormia coastal sailor. The > fetch will be different at every different distance in the path. Jared You bring up an interesting memory that I had put aside regarding fetch and waves (which would also affect current). This summer (AKA the "summer that never was" on Lake Michigan) a lot of wind from the north. Sailing out of Michigan City on the southern coast. 10-28 kt breezes out of the north for several days one extended weekend. 10 statute miles (love those Great Lakes charts) big but nicely formed wave trains and swells. Within 2-3 miles of the dunes, mashed potatoes--huge piles of water. Reading Trevor and thinking back, I was "set up." What we saw was water bouncing of the southern shore in depths ranging from 40-200 feet. In this case, although fetch was several hundred miles and time was in days, because we were in near proximity to the shore (an perhaps factor in onshore breezes kicked up a notch by the the northerly breeze--exacerbated by shallow depths) it was a wild ride. While fetch related to waves/wind-induced current may indeed be measured in shore-to-ship distance for Doug on the high seas, in this case you make a strong point that what is leeward of the craft and proximity also plays a role. Bill