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    Re: taffrail log (Walker's log)
    From: Jeremy C
    Date: 2008 Oct 12, 16:03 EDT
    Logs on any and all merchant ship's I have sailed on all use sonic waves to measure speed through the water.  The really advanced ones can tell you lateral bow and stern speed as well as speed through the water.  Most of the ones I have sailed with are way out of calibration, like on my current ship, and are generally ignored.  I will put it on the shipyard list, but I am fairly certain it will be cut.  I have seen one taffrail log in my school, but never in use.
     
    Jeremy
     
     




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