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Floating-card compass with prismatic sight (bearing 220° through eyepiece). The marine hand compass, or hand bearing compass|hand-bearing compass as it is termed in nautical use, has been used by small-boat or inshore sailors since at least the 1920s to keep a running course or to record precise bearings to landmarks on shore in order to determine position via the resection technique.
Silva Field baseplate compass on a map. Silva Sweden AB is an outdoors products company that sells handheld compasses and other navigational equipment including GPS tools, mapping software, aircraft altimeters, and marine navigation tools.
It consists of a small board with a knotted piece of twine through the center. The observer holds one of the knots in his mouth and extends the board away so that the edges make a constant angle with his eyes. Mariner's astrolabe Derived from the astrolabe, it was developed in late 15th century and found use in the 16th to 17th centuries.
A compass binnacle in front of the ship's wheel. The small stove-pipe chimney vents the lamp used to illuminate the compass face at night. Gauge binnacle in a 1989 Ford Probe. Before 18th century bittacle, through French bitacle, from Latin habitaculum, "little dwelling".
Let us suppose now that and that , that is the axis of the gyroscope is approximately along the north-south line, and let us find the parameter space (if it exists) for which the system admits stable small oscillations about this same line. If this situation occurs, the gyroscope will always be approximately aligned along the north-south ...
Pelorus aboard HMS Belfast. In marine navigation, a pelorus is a reference tool for maintaining bearing of a vessel at sea. It is a "simplified compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings.