Saturday, August 25, 2012

Course Recorder

 


Your Guide to Seafaring

Course Recorder: An Essential Navigational Tool

Introduction

A Course Recorder is a vital navigational instrument used on ships to automatically record the course steered by the vessel over time1. This record is crucial for providing evidence of the ship's course in case of an accident, such as a collision or grounding. The course recorder ensures that minute to minute records of the course and time are maintained accurately, which is difficult to achieve manually due to factors like weather, yawing, and fluctuations in steering.

Working Principle

The course recorder operates by receiving signals from the ship's Master Gyro Compass. These signals control a spirally grooved drum that moves the course and zone styli. The course recorder paper, which resembles graph paper, has three main sections: the time scale, the course section, and the quadrant section.

  • Time Scale: The vertical axis of the paper, usually marked in 10-minute intervals, is used to set the course recorder to the correct UTC or GMT at the beginning of the voyage.
  • Course Section: The middle portion of the paper is graduated for 90° intervals, allowing the course to be read to the nearest degree.
  • Quadrant Section: Located on the side of the paper, this section helps identify the correct quadrant of the course.

Components and Operation

The course recorder consists of several key components:

  • Styli: There are two styli, one for marking the quadrant of the course and the other for marking the course in that quadrant. These styli are inkless and make impressions on the thermal paper.
  • Drum: The drum has a continuous zigzag groove and a stepped groove, which guide the movement of the styli across the paper.
  • Paper Feed DC Motor: The paper roll is driven by a DC motor in sync with UTC, ensuring accurate time recording.


Importance and Usage

The course recorder is considered essential for maintaining a continuous and accurate record of the ship's course3. This record is vital in case of any investigation following an accident. The course recorder helps in identifying whether the vessel is steering a steady course or if there are deviations due to weather or compass errors.

Maintenance and Testing

Regular maintenance and testing of the course recorder are crucial to ensure its proper functioning:

  • Maintenance: The course recorder should be checked regularly to ensure that the correct course is being recorded and that the pens are full of ink. It should be switched off in port and the date, time, and place should be noted.
  • Testing: The course recorder should be tested at the commencement of a voyage to ensure it is set correctly and functioning properly.

Recent Developments

With advancements in technology, new paperless course recorders have been introduced. For example, the X-VCR paperless Course Recorder from AMI Marine supports both paperless course recording and traditional dot-matrix printing. It offers a touch screen display, real-time graphical presentation of data, and the ability to store up to 36 months of voyage data on a solid-state drive.



Conclusion

The course recorder is an indispensable tool for navigators, providing a reliable and accurate record of the ship's course. Its importance in ensuring maritime safety and aiding in accident investigations cannot be overstated. With the advent of paperless systems, the course recorder continues to evolve, offering more efficient and user-friendly solutions for modern vessels.

 

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