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Re: Silicon Sea: Leg 83 Answers
From: Dan Hogan
Date: 2002 Sep 25, 06:21 -0700
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 @ 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 @ 16/07/2001 -(+10) ZT ----- 09:19:12 ZT 16/07/2001 Dan Hogan WA6PBY C27 "Gacha" dhhogan1@earthlink.net Nav-L Page: http://www.wa6pby.com