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post #30 of Old 11-26-2011
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Originally Posted by smurphny View Post
Exactly. I have one of those damned things, 70s vintage. Every time I look at that plastic gizmo in the bottom of my boat, it gives me the willies! Going to plug it up permanently. With GPS, these are pretty much obsolete. If I ever need a mechanical knot reading, will use the old knot tube (or a knotted line:-)
The nice thing about a mechanical speed sensor is that one can see the effect of current on the boat.

GPS give a great SOG, yet.... there is no information about current.....
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