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» Online Classroom   »   » Public Discussion of Inland and Coastal Navigation   » 5-10

   
Author Topic: 5-10
M. C. Rowley


 - posted August 17, 2005 07:22 PM      Profile for M. C. Rowley           Edit/Delete Post 
Assuming a steady course of 272M, the closest distance to Otter Point should be 3.0 nmi instead of 1.3 nmi (as indicated in the answer section) unless there is a strong southerly current we were not told about. I did come up with the correct answer of 352M for Part A and 1.7 nmi for Part B. Am I missing something here?
David Burch


 - posted August 18, 2005 06:46 PM      Profile for David Burch           Edit/Delete Post 
The answers in the book look to be right. It appears to be a misuderstanding of the terms involved. Here is a picture from our notes (for 35° not 40°, but the principle is the same).

In no 5-10, the blue line is the 1.7 nmi, ie distance off = distance run. and the red line is the perpendicular closest point of approach, in 5-10 this is 1.3 nmi.

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From: Starpath, Seattle, WA
M. C. Rowley


 - posted August 18, 2005 09:23 PM      Profile for M. C. Rowley           Edit/Delete Post 
Oops! I used 272T instead of 272M. This isn't the only time I have done this. Sorry about that!

Mark



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