Compass dial

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a small pocket compass fitted with a sundial to tell the hour of the day.

See also: Compass

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Conditions were variable for the closing clay of the Winter Series, with the CYCA's leading female compelitors out in force for some fine racing in a 4-5 knot westerly breeze that flicked either side of west on the compass dial and dropped to 1.5 knots as the back markers crossed the start line.
Other sixteenth-century devices used an arm above the compass dial to cast a shadow representing the true N/S direction on the dial, but the principle was the same.
When I come up to this tree my direction and cross reference heading will marry up to exactly what is indicated on the compass dials. A tree will make sense of this trick.