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    Re: Silicon Sea: Leg 85
    From: Dan Hogan
    Date: 2002 Nov 14, 06:10 -0800

    On 12 Nov 2002, at 14:30, Paul Hirose wrote:
    
    > 1. Total distance from Hanalei Bay to L.A. Light = 3990 miles
    
    Too high. waht method are you using for calculations? Try using Mid-Latitude
    leg-by-leg.
    
    > 2. Based on a Speed of 10 Kts it will take 16.6 days to L.A. Light.
    
    See Q1.
    
    > 3. At 7.5 gallon/day total water consumption, total to the L.A. light
    > will be 125 gallons. The vessel has a 220 gallon capacity, so there
    > appears to be enough.
    
    OK
    > 4. TC from Hanalei Bay to MOP1 is 013.
    
    OK
    
    
    > 5. Departure was at local apparent noon.
    
    Right
    
    > 6. TC to MOP1 = 014.
    
    OK
    
    
    > 7. Steer 1 degree left for current and subtract 11.5 deg compass
    > error. Compass course = 002 to MOP1.
    
    OK
    
    
    >
    > Mostly I used plotting sheets and did the computations graphically.
    > For the current correction I'd normally use an E-6B slide rule, but
    > this time I drew a current triangle on the plotting sheet for the
    > sake of variety.
    
    If you like plotting sheets and non-calculator try Mid-Latitude for the leg
    calculations.
    
    > Looking at the answers, my distance was about 25% off. Even on
    > plotting sheets I think I should have done better. May have made a
    > mistake. At least I got the initial course right within a couple
    > degrees. As an instructor told my class many years ago, the most
    > important output from any nav system is "which way do we go".
    
    Saiboat compasses are divided into 5 degree increments, sailing closer than
    2.5d to that is guess work.
    
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan1---.net
    Nav-L Page: http://www.wa6pby.com
    
    
    

       
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