one more link... http://www.opentip.com/product_info.php/cPath/1_4_542_2354_2635/products_id/...

...

The only knot meters I'm familiar with require a through hull fitting to accommodate the paddle wheel

I use a portable knot meter sold by Speedtech. Mine appears to be obsolete, but the current model is shown at http://www.speedtech.com/asp/product.asp?recorprod=1&product=206&cat=35& ph=&keywords=&recor=&SearchFor=&PT_ID=

Seems to work well, and I was sufficiently happy with it to buy a second one when the first wore out after a few seasons of abuse.

Giles Morris

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