NavList:
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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
