Knot meter

[Loren Beach]

http://www.altimeters.net/altjdcspeedwatch.html

Interesting small boat speedometer product. No hole in the hull.

Never seen one, just wandered across this while looking for something else...

"google on"
:nerd:

LB

 

[boethius27]

http://www.knotstick.com/

I'm still enthralled with this idea. Don't own one yet, but I will....

 

[tenders]

I had one of these many years ago on Lake Erie.

It works, more or less. More in the sense that it does give you a reasonable indication of your speed through the water. Less in the sense that the disk you trail behind you on a long stretchy string will foul on any bit of seaweed that you pass through, throwing off the readings. Also, the stretchy string has a tendency to get tangled if you haul it in.

Really isn't worth the trouble. Just use your GPS for SOG and call it a day.