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Re: Silicon Sea, Leg 12 question
From: Peter Fogg
Date: 2006 Jul 6, 17:22 -0500
From: Peter Fogg
Date: 2006 Jul 6, 17:22 -0500
Renee wrote:
All of this seems quite correct. There does seem to be an anomaly here.
If this rejigging fits the scenario better then that seems fine. You may have been the first to notice this inconsistency. Well spotted.
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At the beginning of problem 12, it has just traveled for 30 hours on a
course of 96.2 T, 7.5 knots, arriving at 09-22-00 GMT at 38d 31.5'N 10d
25.6'E, 12.9 nmi from its waypoint in the Strait of Sicily.
Then, in problem 12-3, at 11-17-16 GMT, the vessel takes a Noon Latitude
from a DR position of 38d 35.0'N 09d 45.7'E, 44.5 nmi from the waypoint. In
order to have gotten to the 11-17 position from the 09-22 position in 2
hours, the vessel would have had to have sailed for 2 hours at 276 true,
16.4 knots.
All of this seems quite correct. There does seem to be an anomaly here.
I have decided to avoid this "reversal of course" problem without changing
the Noon Latitude position -- simply slow the vessel down a bit, and alter
the 09-22 GMT DR position. I cannot think of a plausible "story line" to
explain reversing course for 2 hours, so I think this slight rewriting is
more true to the original intent.
If this rejigging fits the scenario better then that seems fine. You may have been the first to notice this inconsistency. Well spotted.
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