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On 9 Jul 2001, at 14:06, Michael Wescott wrote:

> > We then motor to the Isla Flamenco and anchor at(08d 55.2'N 79d 31.6'W) to
> > do the final trip planning, servicing, and provisioning the boat. We will
> > motor from our anchorage to abeam the Light at Isla San Jose(08d 10.5'N 079d
> > 15.0'W). Speed 8.3 Kts. Our departure is planned for sunrise on 24/06/2001.
> >
> > 1)  What is the Zone Time(ZT) of sunrise at our anchorage?
> >     What is the UT/GMT time of Sunrise?
> > --  ------------------------------------------------------
>
> Anchorage at 08d 55.2'N 79d 31.6'W. Sunrise on 24-Jun-2001 will be
> shortly after 0541 LMT. LMT is 4d 31.6' West so we add about 18 min to
> get ZT. And for GMT we add 5 hours. A close enough answer is
>
> 0600 ZT (GMT+5)
> 1100 GMT
>
> Wow, sitting in the Pacific further east than where I'm sitting now
> (Columbia, SC).

Correct to both :^)

> > 2) What is the TC and Distance  from Our anchorage(08d 55.2'N 079d 31.6'W)
> >    to abeam of Isla San Jose Light(08d 10.5'N 079d 15.0'W)?
> > -- -----------------------------------------------------------------------
>
> Reading directly from the chart (or plotting sheet, in this case)
>
> C = 160T    D = 47.6

YEP.

> > It is late in the season and the North Pacific storms are beginning so we
> > elect to bypass the Galapagos Islands. We will follow the recommendations in
> > Ocean Passages For The World and in World Cruising Routes and on departing
> > Isla San Jose Light(08d 10.5'N  79d 15.0'W) we will head for a Mid-Ocean
> > Point(MOP) at (03d 00.0'N  110d 00.0'W).
>
> Why so far south? To avoid the storms? Don't we risk light winds so far
> south?

Avoid the North Equatorial Counter Current, also follow and favorable winds.

> > 3) What is the TC and Distance to the MOP at (03d 00.0'N  110d 00.0'W)
> >    from Isla San Jose Light(08d 10.5'N  79d 15.0'W)?
> > -- ------------------------------------------------------------------
>
> Using M.P.:           C = 260.4T   D = 1861.9
> Using M.L. (5d30'):   C = 260.4T   D = 1862.6
> Using GC:            IC = 262.1T   D = 1861.5

OK

> > From the MOP(03d 00.0'N 110d 00.0'W) we head to make landfall on the
> > Southwest coast of Hawaii(19d 30.0'N 154d 45.0'W). We have two alteratives
> > depending on current and weather, either a Great Circle Course or the Rhumb-
> > Line course.
> >
> > 4)  Calculate the Rhumb Line TC and Distance to landfall.
> >     Calculate the Great Circle initial course and Distance to landfall.
> > --  -------------------------------------------------------------------
>
> Rhumb Line (M.P.):    C = 290.5   D = 2820.2
> Great Circle:        IC = 294.2T  D = 2801.1
>
> > 5) To the nearest tenth of a day, what are the total days enroute from our
> >    anchorage at Isla Flamenco to the Southwest coast of Hawaii as our plan
> >    is layed out? Sailing Speed 9.5 Kts, motoring Speed is 8.3 Kts:
> >
> >     Isla Flamenco (08d 55.2'N 79d 31.6'W)
> >     Isla San Jose Light(08d 10.5'N 079d 15.0'W)
> >     Mid-Ocean Point(MOP) at (03d 00.0'N  110d 00.0'W)
> >     Southwest coast of Hawaii(19d 30.0'N 154d 45.0'W)
> > -- ------------------------------------------------------------------------
>
> For planning purposes we'll use the longest (Rhumb Line) and slowest (8.3
> knot, 199.2 nmi/day).
>
> Leg 1:   47.7
> Leg 2: 1861.9
> Leg 3: 2820.2
> =============
> Total  4729.8 which is 23.7 days

Planning wise OK. Q5 asked for 9.5 Kts.

> > Having a 6 person crew and water consumption at 1.5 US Gal/day per person.
> >
> > 6)  What is the expected water consumption for the trip to Hawaii?
> > --  --------------------------------------------------------------
>
> 213.3 gal

OK, for your planning.

> > 7) Estimating 3lbs of food per day per person what is the total weight
> >    in food for the trip?
> > -- -------------------------------------------------------------------
>
> Twice the water. 426.6 lbs.

Ditto as above.
>
> --
>         Mike Wescott
>         Wescott_Mike@EMC.COM



Dan Hogan WA6PBY
C27 "Gacha"
dhhogan@verimail.com
Nav-L Page: http://www.wa6pby.com

   

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