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    Re: Silicon Sea: Leg 75
    From: Dan Hogan
    Date: 2001 Jun 21, 10:02 PM

    On 21 Jun 2001, at 9:57, Michael Wescott wrote:
    
    > > Our last position FIX was (10d 30.0'N 78d 30.0'W) at 10:16:28UT {at}
    > > 04/06/2001. We are bound for Cristobal, Panama(09d 23.0'N 79d 55.0'W). Our
    > > Estimated Time of Arrival(ETA) at Cristobal is 16:34:28ZT {at} 04/06/2001.
    >
    >
    > > 1)  What day of the week of our arrival?
    > > --  ------------------------------------
    >
    > Monday (4 Jun 2001)
    
    OK
    
    > > On VHF we call the Panama Canal Transit Authority on Channel 16 for
    > > instructions. We are required to fly the Panamainian Courtesy Flag from the
    > > Starboard spreader and the quarantine flag from the port spreader.
    >
    > > 2)  What color is the quarantine flag?
    > > --  ----------------------------------
    >
    > Yellow or "Q"
    
    Right
    
    > > We anchor overnight, since the Panama Canal Authority requires 24 hours
    > > notice. We are anchored in an area known as the "Flats" until we can
    > > approach for inspection.
    >
    > > After our approach approval and customs clearance on the next day we begin
    > > the process of making the preparations for transiting the Panama Canal. The
    > > mooring fee is $00.50 per foot to each greater foot per night.
    >
    > > 3)  What is the mooring fee for Silicon Sea per night?
    > > --  --------------------------------------------------
    >
    > $24.50 (based on a 49' LOA).
    
    OK. They actually charge the next foot greater, I'm told.
    
    > > We are required to have 4 dock lines 125 feet long with a three foot eye on
    > > one end. And strong attach points.
    >
    > > 4)  Can we make these lines from a 500 foot roll of 3/4' line?
    > > --  ----------------------------------------------------------
    >
    > Nope. Aside from the fact I always mess up the first eye, cut it off
    > and throw it away, a 3' eye adds at least 4' to 5' so each line would
    > require about 130' of rope.
    
    Right
    
    > > The actual canal transit takes about 12 hours to complete. However,
    > > completing the Admeasure, getting Cruising Permits, clearing Customs and
    > > Immigration inspections can take 3 to 14 days for a small boat. It will take
    > > Silicon Sea until June 14 to complete the transit she is on the Pacific side
    > > of the Panama Canal.
    >
    > What's the toll these days? I'd heard somewhere that they were going
    > to increase it for yachts.
    
    As of my last check, the transit fee for boats 50' and under is $500.00 plus
    a buffer fee of $700.00 that is returned after the completion of the transit,
    if you don't damage the canal. Plus the charges for the various inspections.
    
    > > 5) In what direction does the Panama Canal run from the Atlantic Side to
    > >    the Pacific side?
    > > -- ---------------------------------------------------------------------
    >
    > South East.
    
    Right
    
    > > While moored and waiting to complete the required inspections before
    > > transit. The Skipper worked the following two celestial problems.
    >
    > > DR position(09d 24.6'N  79d 56.7'W) on 11/06/2001.
    >
    > >   No. 1  UT/GMT         Body        Hs
    >
    > >          23:41:30       Arcturus    51d 58.7'
    > >          23:42:10       Procyon     29d 24.3'
    > >          23:43:05       Spica       57d 44.3'
    >
    > > 6)  What is the FIX position for SR No. 1?
    > > --  --------------------------------------
    >
    > The LOP's form a nice triangle with the DR position in the center and
    > about 1.0 nmi from each LOP.
    >
    > Did you mean for the IC to be -2.5' rather than the -1.5 given?
    
    Yes. I forgot to change it in the problem Note.
    >
    > Fix: 9d 24.6'N  79d 56.7'W
    >
    > > These are the same sights as listed in Q6. But this time all numbers are to
    > > be ROUNDED to the nearest whole number. If you are using a calculator or
    > > Computer program round any numbers that are accessible, ie. Lat, Lon, Hs,
    > > GHA and Dec, to work the sight reduction and plot both FIXes. DO NOT ROUND
    > > TIME.
    >
    > >          UT/GMT         Body        Hs
    >
    > >          23:41:30       Arcturus    51d 59.0'
    > >          23:42:10       Procyon     29d 24.0'
    > >          23:43:05       Spica       57d 44.0'
    > `
    > > 7)  What is the FIX position for SR No. 2?
    > > --  --------------------------------------
    >
    > This set of LOP's gives a slightly larger triangle. The fix shifts
    > north and east.
    >
    > Fix 9d 26'N 79d 56'W
    >
    > > Now compare the two FIXes.
    >
    > The fixes are close together, about a 1.5 miles apart. The biggest
    > difference is in the LOP's for Arcturus. Rounding errors accumulated
    > to another mile, whereas the differences in the LOP's for the other
    > sights was due almost entirely to the change in DR.
    >
    > On the whole the second fix was easier to calculate and lost little
    > in the way of accuracy. The calculations that contributed most to
    > the difference was the rounding of Ha.
    
    My point. For sailboats traveling at the speeds we do. it it a waste of
    effort and time to do SR to greater than the nearest minute.
    >
    >
    > --
    >         Mike Wescott
    >         Wescott_Mike{at}EMC.COM
    
    
    
    Dan Hogan
    dhhogan{at}verionmail.com
    

       
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