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OICNW-3-1K

Parallel indexing

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

Parallel indexing

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 relative motion north up mode, with aids to navigation and a coastline displayed on the display.

Behavior

Use a parallel index line to monitor and maintain the vessel on track.

Standard

  1. Constructed a parallel index line through the edge of the known hazard to navigation or land mass; and,
  2. Monitored the vessel’s movement in relation to the parallel index line or an electronic display of the distance off the index line to determine if the vessel moved toward the hazard or landmass.
  3. The vessel must not drift more than 10 % of the set distance toward the parallel index line.