society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > dial on vertical place facing cardinal point
1669 S. Sturmy vii. vi. 11 The Vertical Dial, whose Plane lieth in the Horizon, for which cause many call it the Horizontal Dial.
1728 [see sense B. 3]. 1877 VII. 155/1 Vertical dials, when on a vertical plane facing one of the cardinal points.