While sailing to weather in waves, the bowman should keep an eye on the top leeward tell tale on the jib. If it ever stalls, there is not enough twist in the jib, and the effect can be a bad case of the slows...
Sailing Instructions are reissued from time to time.
New issue for Skipper's meeting. Has been reviewed, but minor change is possible, always.
My best description of what's changed!