What does the layline have to do with proper course?Edit
This is one of the most commonly argued matters especially when it comes to rule 17.1 because the auto-umpire in VSK does appear to use the computed layline in it's algorithm for determining whether or not a boat is sailing her proper course. The layline to a mark is not necessarily the proper course because a skipper may need to factor such variables as wind shifts, stream, tide and obstructions into the decision making process for determining the proper course.
This is one of the reasons why you may often see a race announced as "NPC except 17.1"
- If my best course is the course I would sail to finish as soon as possible then isn't that the same as my proper course?
- Most of the time it is the same. In fact the concept of "proper course" only comes into play when one of these three rules is cited as reason for a protest.
Rules 17, 18.4 and 23 restrict you from sailing beyond your proper course even if doing so would be a better course for you to sail. Rule 18.5b actually protects your right to sail your proper course as you round a mark provided that you are taking mark-room to which you are entitled.
- For an excellent (illustrated) discussion of proper course see rrsstudy.blogspot.com - Proper course
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