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    Re: Silicon Sea: Leg 83 Answers
    From: Dan Hogan
    Date: 2002 Sep 25, 06:21 -0700

    On 25 Sep 2002, at 12:01, Peter Fogg wrote:
    
    > Any chance of more detail about how the answer to Q7, the time, was
    > arrived at?
    >
    > Often find my calculations for elapsed time on SS legs  differ from the
    > answers, but not sure why.
    > Could we see the times for each leg?
    
    Here are my calculations "COURSE TO STEER" ARE IN PC-8 font from NavPO93.
    5.  CC to clear Cape Kumukahi by 4 Nmi
            19d 30.0'N  154d 45.6'W
                            - 4.0'
                        154d 41.6'W
    
    ����������������������͵ [2] COURSE TO STEER ���������������������������ͻ
                                                                             �
                 Variation 10.0� E         Deviation  1.0� E                 �
                                                                             �
     Lat 1    19� 25.1' N      Speed     10.0      Lat 2    19� 30.0' N      �
     Lon 1   154� 31.9' W      Drift      0.7      Lon 2   154� 41.6' W      �
                               Set       95.0�                               �
              Desired          ===Needed===>>      CompCrse 285.5�           �
           TrueCrse 298.0�                         SpMdGd     9.4            �
           Distance  10.4                          Time   1h 06.9m           �
                                                                             �
    ������������������������������������������������������������������������ͼ
    
    6. Dist Cape to Hilo
    
    ����������������������͵ [2] COURSE TO STEER ���������������������������ͻ
                                                                             �
                 Variation 10.0� E         Deviation  1.0� E                 �
                                                                             �
     Lat 1    19� 30.0' N      Speed     10.0      Lat 2    19� 44.0' N      �
     Lon 1   154� 41.6' W      Drift      0.4      Lon 2   155� 04.0' W      �
                               Set      270.0�                               �
              Desired          ===Needed===>>      CompCrse 293.7�           �
           TrueCrse 303.4�                         SpMdGd    10.3            �
           Distance  25.4                          Time   2h 27.7m           �
                                                                             �
    ������������������������������������������������������������������������ͼ
    
    
    7. ETA Hilo Point
    
        RFIX 01:44:36 UT {at} 16/07/2001
             14:00:00 Hrs. = 140 Nmi / 10 Kts  to DR
             01:06:54 Hrs. to Cape
             02:27:42 25.4 Hrs to Hilo
             --------
             19:19:12 UT {at} 16/07/2001
          -(+10) ZT
             -----
             09:19:12 ZT 16/07/2001
    
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan1---.net
    Nav-L Page: http://www.wa6pby.com
    
    
    

       
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