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OICNW-3-2L

Function: Navigation at the operational level

Competence Knowledge, Understanding & Proficiency Task

Use of radar and ARPA to maintain safety of navigation

A3.4 Ability to operate and to interpret and analyze information obtained from ARPA, including:

  1. system performance and accuracy, tracking capabilities and limitations, and processing delays
  2. use of operational warnings and system tests
  3. methods of target acquisition and their limitations
  4. true and relative vectors, graphic representation of target information and danger areas
  5. deriving and analysing information, critical echoes, exclusion areas and trial manoeuvres

Navigation lines

Assessed in: MT-3222 Automatic Radar Plotting Aids

Condition

On an operational ARPA that meet the standards of 33 CFR 164.38 (or an ARPA simulator that meets applicable national and international performance standards for ARPA), with the ARPA on the 12 mile scale, using 2 nav marks and one nav line.

Behavior

Establish a nav line to monitor and maintain the vessel on track.

Standard

  1. Constructs a nav line between the 2 nav marks and through the seaward edge of the known hazard to navigation or land mass;
  2. Positions the VRM at a distance named by the assessor from the edge of the nav line; and
  3. Monitors the vessel’ movement to determine if the edge of the VRM moves inside the nav line.
  4. The VRM must not drift more than 10 % of the VRM distance inside the nav line.