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Re: How are you guys determining vis?


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Posted by Chuck Tribolet on March 11, 2007 at 20:04:53:

In Reply to: How are you guys determining vis? posted by Eric S on March 11, 2007 at 18:22:09:

When my grey anchor is just visible against the tan sand. And
there are markers on the anchor line so I have a pretty good
measurement of how far from the anchor. I can usually see a
high contrast target (sand/rock boundary) about twice is far.

The OFFICIAL way to measure vis is with a Secchi disk, which is a
rather high contrast target. http://en.wikipedia.org/wiki/Secchi_disk



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