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Subject: Re: Silicon Sea: Leg 83 answers
From: Dan Hogan (dhhogan1@XXX.XXX)
Date: Fri Sep 20 2002 - 12:41:04 EDT
On 19 Sep 2002, at 16:26, Paul Hirose wrote:
> 1. The navigator should see the peak of Mauna Loa about 135 miles out.
OK
>
> 2. TC = 286. Subtract 1 degree for current. Subtract 11 degrees for
> compass error. CC = 274 to Mauna Loa.
OK
>
> 3. Nearest multiple of 15 deg longitude is 150W, so we are 10 hours
> behind UT
OK.
>
> 4. DR at 140 mile point is 19 24 N 154 32 W.
OK
>
> 5. TC = 305. Add 1 degree for current. Subtract 11 degrees for compass
> error. CC = 295 to pass Cape Kumukahi.
OK
>
> 6. Distance from passing Cape Kumukahi to Hilo entry point is 26
> miles.
OK
>
> 7. Total DR distance from the running fix to Hilo entry point is 177
> miles. At 10 knots we should arrive there July 17 about 0100Z, or July
> 16 1500 ZT. That ignores any current.
Someone is off on the time. RFIX 01:44:36 UT @XXX.XXX
>
>
> I used a piece of typing paper to make a plotting sheet. The horizon
> distance and heading computations were done on an E-6B aeronautical
> slide rule. The wind side works perfectly well for current; you just
> mentally divide the speed markings by 10 or 20.
This is the way I navigated for years. I still do on my boat, when I go long.
I still carry my original Dalton E-6B.
Dan Hogan WA6PBY
C27 "Gacha"
dhhogan1@XXX.XXX
Nav-L Page: http://www.wa6pby.com
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