To expand on a question asked earlier, which number matters more, the 'Swell' or 'Swell period'? And how does the secondary swell play a part in it? I heard previously that a swell of more than 3 or 4ft was problematic in CGB and WB. It sounds like there may be more to it, though. Your expert opinions are appreciated.

Here's a Windguru reading as reference...

http://www.windguru.cz/int/index.php?sc=58