Marine library

Yaw refers to the rotation of a vessel around its vertical axis, resulting in a change of heading. It is one of the six degrees of freedom in vessel dynamics and is actively controlled by Dynamic Positioning (DP) systems to maintain precise orientation during offshore operations.

Worst Case Failure refers to a system failure that results in the most significant functional degradation within a vessel’s Dynamic Positioning (DP) or operational systems. This concept is essential in the design, assessment, and operation of DP systems, particularly for vessels with high redundancy requirements, as it helps ensure safety and reliability under adverse conditions.

A Wind Sensor is a device designed to detect wind strength and direction, transmitting this data to remote displays or integrated systems like Dynamic Positioning (DP). Accurate wind data is critical for maintaining vessel stability, ensuring operational safety, and optimizing performance in maritime and offshore environments.

Wind Feed Forward, also known as Wind Compensation, is a feature in Dynamic Positioning (DP) systems that processes rapid changes in wind strength and direction, enabling immediate thruster adjustments. This function is particularly critical in gusty conditions, where sudden wind changes can significantly impact a vessel's stability and position.

WGS84 (World Geodetic System 1984) is the global geodetic reference framework used by the Global Positioning System (GPS) and other navigation systems. It defines the shape and size of the Earth as an oblate spheroid, along with a coordinate system and reference ellipsoid, enabling precise positioning and mapping worldwide.

At Lerus Training, we provide in-depth courses on all aspects of Dynamic Positioning (DP) operations, including advanced functions like Weathervane Mode. Our training programs ensure maritime professionals gain a comprehensive understanding of DP systems, helping them optimize performance, enhance safety, and tackle complex operational challenges with confidence.

Vertical Reference Sensors (VRS) are critical devices used in maritime and offshore operations to provide precise measurements of a vessel's roll and pitch. These sensors play an essential role in Dynamic Positioning (DP) systems, ensuring accurate data for maintaining vessel stability and alignment during complex tasks.

A UTM Zone is one of the 60 divisions within the Universal Transverse Mercator (UTM) coordinate system. Each zone spans 6 degrees of longitude, covering the globe from 180° west to 180° east. The zones are further divided into northern and southern hemispheres, facilitating precise positional measurements in metric units. Variations of the UTM system are sometimes implemented in specific localities to meet regional needs.

The Universal Transverse Mercator (UTM) is a projection and coordinate system used to define a vessel’s position in terms of Northing and Easting coordinates, measured in meters within a specific UTM zone. This system is widely employed in maritime and offshore operations, offering a straightforward method for expressing positions on a global scale with high precision.

USBL (Ultra Short Baseline) is an acoustic position reference system used in Hydroacoustic Position Reference (HPR) applications. Synonymous with SSBL (Super-Short Baseline), this technique facilitates two-way communication between a hull-mounted transducer on a vessel and a transponder positioned on the seabed or another fixed underwater location. USBL is integral to ensuring precise positioning for vessels and subsea operations.