A sailboat racing calculator which is used on a sailboat in conjunction with a compass and a boat speed indicator. A compass dial marked with compass bearings is coaxially rotatably supported below a reference plate having a window for viewing the compass markings on the compass dial. A boat speed arm is pivotally mounted relative to the compass dial and reference plate. The compass dial and the boat speed arm are rotatable relative to one another and the reference plate. A speed read-out arm is mounted to slide perpendicularly to the vertical axis of the compass dial, reference plate, and boat speed arm to permit the sailor to utilize his compass readings and boat speed readings to determine optimum compass headings for sailing each leg of a racing course in the fastest time possible.
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