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    Re: Silicon Sea: Leg 70
    From: Yves Arrouye
    Date: 2001 Apr 23, 1:23 AM

    > 1)  What is the total distance in nautical miles to Cristobal?
    > --  ----------------------------------------------------------
    Using great circle sailings:
    Leg 1: 287.1d  84   Nm
    Leg 2: 264.4d 519.9 Nm
    Leg 3: 228d   712.3 Nm
    for a total of 1316.2 Nm.
    > 2)  How many days (to the nearest tenth) is it to Cristobal?
    > --  --------------------------------------------------------
     At 7.5 knots, that's ~ 175 hours -> 7.3 days.
    > 3)  What is our Zone Time(ZT) ETA at the St. Lucia/St. Vincent
    >     Pass waypoint?
    > --  -----------------------------------------------------------
    Looking for sunrise in the Nautical Almanac, sunrise is 0532 at this
    latitude. With current, our true course will be 287d at 8.7 knots. The sail
    will take us 9:39 hours. The ETA is thus 1511 ZT.
    > 4)  What is the Compass Course/Course-to-Steer for the Pass?
    > --  --------------------------------------------------------
    302, our TC being 287.
    > 5)  What is our Departure point position to the nearest minute?
    > --  -----------------------------------------------------------
    13d 25 N 61d 30 W
    I used a plotting sheet printed from Ed Falk's site. I don't think I can be
    precise to a minute of arc on these things printed as 8.2 x 8.2 inches. Can
    > 6)  What is the TC from our departure point to MOP1(12d 30.0'N 70d
    >         00.0'W)?
    >     What is the distance?
    > --  ---------------------------------------------------------------
    TC 264.7 Distance 500 Nm.
    > Var 13dW, Dev 1.5dE. Current Set 270d, Drift 0.7 Kts.
    > 7)  What is the Compass Course(CC)/Course-to-Steer for MOP1?
    > --  --------------------------------------------------------
    Assuming we still have a speed of 8.1 knots, CMG is 265 true at 8.8 knots.
    If CMG is 265, CC is 276.5.

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