Assessment OICNW-3-1J

Determine true course and speed of target vessels

Assessed in MT-3122 Radar Observer Certification


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 relative motion north up mode, using any graphically correct method.

Performance Requirements

Behavior Standard
The student will: During assessment, the student shall, at a minimum:

Determine the true course and speed of three target vessels.

For each contact:

  1. Constructed a relative motion triangle on either a reflection plotter, a maneuvering board, or a transfer plotting sheet; and
  2. Solved for the target vessel’s true course and speed within 8 minutes.
  3. The candidate’s true course solution is within ± 5° and the true speed solution is within ± 5 knots.

Supports Table A-II/1 officer in charge of a navigation watch

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

Determine true course and speed of target vessels

Published: 2016-10-28-04:00