Join Date: Dec 2008
Location: Calgary, AB, Canada
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Just let the halyard loose a bit. Mine doesn't slap at all.
At anchor, I put the halyard through a sail tie or tie it back if it is in a stack pack.
It comes off at the dock and is tied off on the side opposite the dock in a location where it will not touch the spreaders, shrouds or anything else. (And goes on at the dock just prior to departure.)
All a part of sailing etiquette.
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As I sail, I praise God, and care not. (Luke Foxe)