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    Horizontal Sextant Angle Exercise
    From: Greg Rudzinski
    Date: 2016 Jul 16, 15:19 -0700

    Here is a special case of a single horizontal sextant angle giving a fix by range, bearing, and two circles of position. Use the linked chart for plot.

    http://www.charts.noaa.gov/OnLineViewer/18725.shtml

    Channel Islands Harbor break water NW Lt. forms a range with oil platform Gina (220.4° T). A sextant horizontal angle is observed (Hs 34° 46') between Oil platform Gina and oil platform Gail. 

    Find:

    1. The bearing to Platform Gail.

    2. The two circle of position radius.

    3. Lat. Lon. of fix.

    I can't think of another situation where four LOPs (COPs) are obtained from a single observation to fix a position other than a rare double range fix.

    Greg Rudzinski

    3. 



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