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» Online Classroom   »   » Public Discussion of Inland and Coastal Navigation   » Chart Problem 8-5

   
Author Topic: Chart Problem 8-5
Joel Lynn


 - posted October 19, 2004 03:09 PM      Profile for Joel Lynn           Edit/Delete Post 
The solution to problem 8-5 is difficult for me to understand. It would seem that if the forward bearing appears unchanged, and the back bearing is decreasing (160 to 135), then the vessel is being set to the right, and should therefore shift course to 315.
David Burch


 - posted October 21, 2004 12:50 PM      Profile for David Burch           Edit/Delete Post 
The key here is the bearing on the bow is to a very distant target, which means that its bearing will not change even though we change positions, whereas the back bearing was to a close target.

A picture might help here. As we get set to the left, the stern target moves to the right. (Note this picture below is schematic, but the same should hold true if we drew this out more carefully, ie coming out of a channel, looking aft to see a lighthouse on the point, then getting set off of it.)

 -

If that does not clarify the situation, please post another note. The main message of the exercise is to use close targets for evaluating set. --david

From: Starpath, Seattle, WA


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