An outstanding feature of the Gyro-Compass is that it makes possible
the recording of the actual courses steered by a vessel. The recording
compass is connected to the electrical circuits like a repeater and
follows the movements of the Master Compass. It not only indicates the
heading at any instant, but also makes a graphic record on a chart.
Radial lines on the chart represent the various courses. Concentric
circles represent time—each small division five minutes—each large
division one hour.
The dial on which the chart is mounted turns with the movements of the
master compass bringing the correct course under the marking point.
As the time advances a line is marked on the chart showing the exact
course steered at a definite time. On starting, the marking arm is at
the inner edge, clockwork moves it toward the outer edge with uniform
motion.
[Illustration: Figure 32.]
The chart shown in Figure 32 forms a valuable record. It was taken on
a ship at a time a radio call was received from a burning oil tanker.
Being within the distance defined by law, the ship was legally, as well
as morally bound to proceed to the distressed ship. The chart shows
that the course was altered to go to the tanker’s aid. It also showed
the exact time, thereby establishing proof as to the fulfillment of
the obligation. A few minutes later another radio call advised that
the fire aboard the tanker was extinguished. The chart shows that the
course was again altered to bring the vessel back on her original given
course.
[Illustration: The Destroyer is the grey-hound of the sea.]
The chart further shows the actual courses steered in holding the ship
on its given course. It shows just how efficiently each helmsman
handles the ship. It provides an excellent method of training helmsmen
to use less helm, effecting a saving by less frequent use of the
steering engine.
The recording compass is a great aid to the Captain and Navigator in
improving the navigating efficiency of the ship.
The recording compass can be supplied as a part of the Gyro-Compass
equipment—its additional cost is small when compared to the saving and
benefits derived from its use.