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    Re: more Leg 57 results
    From: Dan Hogan
    Date: 1999 Aug 19, 13:26 EDT

    >Here are the rest of my results for Silicon Sea Leg 57.
    >
    >4.  ETA Cape Horn = Mar 26 0230 Z, Mar 25 2230 ZT.
    >
    >I divided the 297 miles measured on plotting sheet by 11.1 kt speed
    >(10.3 kt plus .8 kt current practically on our stern).  Since the
    >current was stated, I assumed we were supposed to use it.
    Your procedure is OK. But doing distance measurement on a plotting
    sheet for more than a 2 degree area introduces large errors due to the
    scale. AND as I remember the error gets much worse on a small boat
    under sail in moderate weather.
    >5.  Distance from 2342 Z fix to Cape Horn = 297 nm.
    See 4. above.
    >6.  Compass course = 100.
    Within tolerance. But you can get more accuracy using one of the
    Sailings methods for DR.
    >7.  TC & dist to decision waypoint = 76 deg, 146 nm.
    Same as 6. above.
    >Constructed a new plotting sheet for this question.
    >
    >8.  Compass course = 66.
    OK
    >The problem says drift is "0.8 Kts/day".  I assumed this meant 0.8
    >kts.  My E-6B says we should angle 2 deg right to correct for that
    >much current.  Subtract the total compass error of 12 E to obtain
    >answer.
    AArrgghh! Yes the current *IS* 0.8Kts. Forget the per day thing.
    The new Pilot Charts list current in Kts as read on a knotmeter.
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan{at}XXX.XXX
    Navigation-L: http://nav.cnchost.com
    

       
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