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OICNW-3-1F

Determine DRM, SRM, CPA, and TCPA

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

Determine DRM, SRM, CPA, and TCPA

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.

Behavior

Determine: 1. The range and bearing to 3 other ships (meeting, crossing, and overtaking); 2. The DRM and SRM of all other ships; and 3. The CPA and TCPA of all vessels on the 12 mile scale with less than a 3 mile CPA.

Standard

For each contact:

  1. The range and bearing solution is completed within 30 seconds and is within the previously stated tolerances.
  2. The DRM solution is completed within 7 minutes and is within ± 5° of the assessor’s solution.
  3. The SRM solution is completed within 8 minutes of initial range and bearing and is within ± 5 knots.
  4. The CPA solution is completed within 9 minutes and is within ± 0.5 miles.
  5. The TCPA solution is completed within 10 minutes and is within ± 3 minutes.