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    Horizontal Sextant Angle Plot
    From: Greg Rudzinski
    Date: 2013 Jun 10, 15:50 -0700

    For this example a Cassens & Plath sextant with 4 power scope was used to observe a horizontal angle of 21° 54.0' between oil platform Gilda and oil platform Gail from shore (see image 5929). A circle of position (COP) is plotted by deriving the circle radius using half the distance between the two platforms divided by the sin of the observed sextant angle. (3.5 NM/2) / SIN 21.9° = 4.7NM for this example. A compass divider can then be used to plot the circle center by arcing from each platform then a circle of position can be plotted from the circle center (see image 1938).

    Greg Rudzinski
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