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Coming up is a race down some shipping channels, great fun as long as not at night or in 20 knots .... however.
Is there any way of setting the sides of channel as a pair of "gate marks", so that the course must be between the two? I know you could do it with Race Notes, but I am more interested in giving the drivers bearings (i.e. "No lower than x, no higher than y"
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Could you use multiple keep-to-port, keep-to-starboard marks on either side of the channel?
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But then you get a bearing to whichever you put first, left or right ... and then a bearing to the opposite one.