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    Re: Silicon Sea: Leg 83 Answers
    From: Peter Fogg
    Date: 2002 Sep 27, 09:05 +1000

    Dan Hogan wrote:
    
    >
    > 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           �
    >                                                                          �
    > �������������������������������������������������������������������������*
    >
    > 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           �
    >                                                                          �
    > �������������������������������������������������������������������������*
    >
    > 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
    
    For the first segment  we are given, apart from the speed of 10 k, a
    Current Set 095d, Drift 0.7 Kts. Yet the time above for the 140 nm run,
    14:00:00 Hrs, indicates the speed used was the 10 k rather than a lesser
    speed
    influenced by the contrary current, a SMG of about 9.3 k.It makes for
    about an hour's difference. I don't understand this apparent inconsistancy.
    
    The rest is minor -  Distance  10.4 / SpMdGd 9.4 = 1h 06m 23m, rather than
    01:06:54 Hrs, just as Distance  25.4 / SpMdGd 10.3 = 2h 27m 58s, rather than
    02:27:42 Hrs. Can imagine these small differences come about from the
    calculator using internal data that is more precise than that displayed,
    which is rounded to specification.
    
    Despite these whinges and moans, enjoy these Silicon Sea exercises greatly.
    Long may they sail.
    
    
    

       
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