Compass course calculator and plotter

The ornamental design for a compass course calculator and plotter, as shown and described.

FIG. 1 is a front, plan view of a compass course calculator and plotter showing my new design;

FIG. 2 is a bottom side view thereof;

FIG. 3 is a back side view thereof; and,

FIG. 4 is a top view thereof; the left and right sides are typical of the top and bottom side views.

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