Anchor Spring Line
I checked on my poor memory to make sure...
This is a copy taken directly from a section of a page from another source. Not sure of the author,
"ANCHOR SPRING LINES:
Often, you anchor where the Wind and the Water work at cross-purposes. Some anchorages may have a strong current running through them, or sometimes experience a strong surge or groundswell. Even a smaller current or surge can set your boat to rocking - and you know how uncomfortable a rolling boat can be. A really fast current or big swell can make the harbor untenable.
Fortunately, there's an easy way to alleviate all that by the use of a forward quarter spring line to the anchor rode, a technique called "springing the rode".
To understand how Anchor Spring Lines work, it will be helpful to visualize the conditions that call for it. Suppose you're anchored in a harbor where the wind is blowing from the east. Lying to her anchor, your boat will point east into the wind. Now, suppose there's a surge rolling into the harbor from the north (or a current running South). It could be a ground swell generated by some distant storm, or just a remnant of seas outside the harbor bending around the headland. Whatever the source, waves from the north will strike your boat on the port beam and she'll rock-n-roll."
Anyway, there are "spring lines" for docking and "spring lines" for anchoring. I think I originally read it in an old Horatio Hornblower Book (one of my favorites).
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Captain Don Quackenbush
SV HERMES, Pearson 33
East Coast, Great Lakes