Maneuvering Board [pro5090]

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The Maneuvering Board is a diagram used in the solution of relative motion problems such as collision avoidance with radar, and set-and-drift calculations.

Also known as Chart 5090, the Maneuvering Board consists primarily of a polar diagram having equally spaced radials and concentric circles. The radials are
printed as dotted lines at 10-degree intervals. The ten concentric circles are also dotted except for the inner circle and the outer complete circle, which has a
10-inch diameter.

Dotted radials and arcs of concentric circles are also printed in the area of the corners of the 10-inch square framing the polar diagram.

The 10-inch circle is graduated from 0 degrees at the top, through 360 degrees, with the graduations at each tenth degree coinciding with the radials. The radials between concentric circles are subdivided into ten equal parts
by the dots and small crosses from which they are formed. Except for the inner circle, the arcs of the concentric circles between radials are subdivided
into 10 equal parts by the dots and small crosses from which they are formed. The inner circle is graduated at 5 degree intervals.

Thus, except for the inner circle, all concentric circles and the arcs of concentric circles beyond the outer complete circle are graduated at one-degree intervals.

In the left-hand margin there are two vertical scales (2:1 and 3:1); in the right-hand margin there are two vertical scales (4:1 and 5:1). A logarithmic time-speed-distance scale and instructions for its use are printed at the bottom.  Size is 13x14 inches, pads of 50 sheets, printed on both sides.