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OICNW-3-1I

Change speed to control target DRM

Function: Navigation at the operational level

Competence Knowledge, Understanding & Proficiency Task

Use of radar and ARPA to maintain safety of navigation

A3.2 Ability to operate and to interpret and analyse information obtained from radar, including the following:

Performance, including:

  1. factors affecting performance and accuracy
  2. setting up and maintaining displays
  3. detection of misrepresentation of information, false echoes, sea return, etc., racons and SARTs

Use, including:

  1. range and bearing; course and speed of other ships; time and distance of closest approach of crossing, meeting overtaking ships
  2. identification of critical echoes; detecting course and speed changes of other ships; effect of changes in own ship’s course or speed or both
  3. application of the International Regulations for Preventing Collisions at Sea, 1972, as amended
  4. plotting techniques and relative- and true- motion concepts
  5. parallel indexing

Change speed to control target DRM

Assessed in: MT-3122 Radar Observer Certification

Condition

On an operational radar or radar simulator that meets the standards of 33 CFR 164.38 and other applicable national and international performance standards, set on the 12 mile scale in the north up stabilized relative motion mode, with a vessel on the beam with a CPA of less than 0.5 NM ahead.

Behavior

Control the target vessels DRM by changing own ship’s speed in accordance with the COLREGS.

Standard

  1. Determined the new speed to achieve a CPA as specified by the assessor;
  2. Executed a speed reduction; and
  3. Achieved a CPA of not less than -0.2 nm or more than + 0.5 nm. of that specified by the assessor.