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Positioning and Tracking Approaches and Technologies
Published in Hassan A. Karimi, Advanced Location-Based Technologies and Services, 2016
Dorota Grejner-Brzezinska, Allison Kealy
A gyroscope-based DRS is called a gyrocompass. Thus, its directive action is based on the mechanical laws governing the dynamics of rotating bodies. The essential part of a gyrocompass consists of a spinning wheel (gyroscope) mounted in a way allowing freedom of movement about three mutually perpendicular axes. Essentially, a gyroscope becomes a gyrocompass if it can be controlled so that its axis of spin is aligned parallel with the true meridian (north-seeking gyroscope) under the influences of the earth’s rotation and gravity. As the earth rotates, gravitational force attempts to change the gyroscope’s axis of rotation. The resulting motion of the axis of the gyroscope at right angles to the applied force causes it to move to keep the alignment with the earth’s axis of rotation (Navis, 2002).
Design of a speech-enabled 3D marine compass simulation system
Published in Ships and Offshore Structures, 2018
Bin Fu, Hongxiang Ren, Jingjing Liu, Xiaoxi Zhang
The gyrocompass system mainly includes the master compass, electronic transmission box, azimuth repeater compass, liquid connector, damping weight, fork-follower ring, gyro ball, azimuth servo motor, and compass room scene, along with some other parts (Guan and Liu 2009). The master compass is used to provide the heading information, the electronic transmission box is used to launch and adjust the parameter settings. The azimuth repeater compass is mainly used to determine the target position and the liquid connector is used to generate horizontal compass axis control torque. The damping weight serves to generate the compass's vertical shaft friction torque, the fork-follower ring supports the sensitive parts and the gyro ball is mainly used to find the north azimuth servo motor to drive the range dial and rotate the fork-follower ring. The compass room scene is used to place the system equipment and support scene roaming.
Adopting the audible alert system for the electronic chart display and information system for improvement of early navigational situation awareness
Published in Journal of International Maritime Safety, Environmental Affairs, and Shipping, 2020
Inchul Kim, Soyeong Lee, Ikhyun Youn
ECDIS is compulsorily connected to various navigational systems such as Global Navigation Satellite System (GNSS), gyrocompass, and speed log for ship’a position, heading and speed information, respectively. It is voluntarily connected to navigational equipment such as radar, as shown in Figure 2. ECDIS is widely used for route planning, route monitoring, automatic ETA calculation, and electronic chart updating for the sake of enhancing safe navigation and easing watch officers’ workload. So it became the most effective and useful navigational equipment for the watch officer to get comprehensive information that is displayed on a monitor.