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    Re: Silicon Sea: Leg 88
    From: Joe Schultz
    Date: 2003 Jun 30, 23:48 -0500

    Well, a dozen years and the rust has removed all of the paint.  Here
    are my answers to the first part, followed by questions for the
    experts.  I used a calculator with trig functions for the
    calculations and home-made sheets for the graphical solution (after
    locating my Speedbow, C-Thru ruler, and a metric scale).
    1) L2 = 39d 39.0'N     Lo2 = 154d 43.0'W   via Mid Latitude Sailings
       L2 = 39d 39.0'N     Lo2 = 154d 42.1'W   via Mercator Sailings
       L2 = 39d 38.5'N     Lo2 = 154d 43.9'W   via three plotting sheets
    2) 0830:20 ZT 10SEP2002 (1830:20 UT 10SEP2002 +10).  Intermediate DRs
    were plotted every four hours starting 0400 UT 09SEP2002, since we
    are in the open sea.
    1. Are there rules-of-thumb in terms of distance limits for which I
    decide to use Plane, Mid Latitude, or Mercator Sailings?
    2. Plotting sheet dL = 0.5 Nm to calculated L2, which shows my
    current ineptitude in plotting (used 10 sheets of paper to get three
    "good" plots).  How close to calculated Lo2 can I reasonably expect
    to arrive with a correct plot? Note that I cheated and used dL = 2d
    20' for the middle plotting sheet.

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