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Board » Technical Support » cape town to buenos aires

Posted by
goblin


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53
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2008-12-25 10:23:02
2010-10-16 05:44:55 - cape town to buenos aires
I am just trying to understand!;
275 miles to go to buenos aires, I used measuring toll on the screen from my boat to finish, cc was 282 and when cursor on finish line showed me on top right cc 283 which is normal due to the world's shape... so I fix my course to cc 282 and left the boat to sail to the finish.

this morning I just wondered my finishing position and I found my boat nearly 20 miles south of the finish line on the rock!

I check my track if I made a mistake with my commands but did not see any mistake still gives the same figures so why this happened?

now the question is; which compass course we can rely on ? and what was the problem?

regards
aydin
Posted by
captjack1942


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2008-01-18 03:24:03
2010-10-16 21:50:25 - Re: cape town to buenos aires
Goblin,
Assuming you weren't on a TWA course, Both the plotting tool (the compass button) and the cursor read out give a Great Circle course. Which is the shortest route. If you had entered the course from reading them @ 250~ mi you would have been a couple of degrees off a direct chart course. The only way to set a direct course to a point more than 80~mi away is to use the red line in on the course picker tool (the "helm" button). Other wise you will have to adjust your course every 80~100 miles (depending on proximity to the Equator).
Posted by
Wind_Thief


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2010-10-10 20:17:17
2010-10-18 06:31:24 - Re: cape town to buenos aires
thank you Jack,
Posted by
goblin


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2008-12-25 10:23:02
2010-10-18 06:43:15 - Re: cape town to buenos aires
thanks Jack it is good to know this.. I was not aware of it..

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