Creating a Creeping line / Parallel line search pattern

To create a Creeping line / Parallel line search pattern follow the steps below:

Search and Rescue (SAR) patternsSARcreation CSP

  1. Select either Creeping line or Parallel line from the Search Pattern options: Chart app > Menu > New > Search pattern.
  2. Set the Commence Search Point (CSP) by either:
    1. Selecting the Commence Search Point (CSP) coordinates field to enter new coordinates, or.
    2. Selecting the CSP icon located to the right of the coordinates to set your vessel’s current location as the CSP.
  3. Select the Search speed field to set the speed at which the search should be performed.
  4. Select the Track spacing field to set the distance between each search leg.
  5. Define the search rectangle using axes Define by axes:
    1. Select Define by axes.
    2. Select the Search orientation/1st leg direction field to set the orientation for the search pattern, or select the Direction icon located to the right of the Search orientation/1st leg direction field to set your vessel’s current heading as the orientation/direction for the search pattern.
    3. Select the 1st turn direction field to set whether the first turn will be to Port or Starboard.
    4. Select the Major axis field to set the length of the major axis search legs.
    5. Select the Minor axis field to set the length of the minor axis search legs.

    Variable

    Maximum Value

    Track spacing / radius

    5 NM / 5  sm / 5 km

    Search speed

    40 Kts / 46 MPH / 74 KPH

    Major axis/Minor axis

    20 NM / 23 sm / 37 km

    1. CSP icon

    2. Direction icon

    Or, If you would prefer not to define the search rectangle dimensions using the major and minor axis, the rectangle can be defined by setting the coordinates of each corner point instead:

  6. Define the search rectangle using coordinates Define by corner points
    1. Select Define by corner points.
    2. Enter coordinates for Corner 1, Corner 2, Corner 3 and Corner 4.
      Note

      • The corner coordinates need to form a rectangle. If the coordinates are not suitable then you will not be able to create the search route.

      • The CSP must be on one of the sides of the search pattern.

      • For a Creeping Line search pattern the CSP must be located along one of the longer sides.

      • For a Parallel Line search pattern the CSP must be located along one of the shorter sides.

      • The CSP must be on a bearing of between 85° to 95° (i.e. right angle ± 5°) from the previous side.

      • The CSP should be half a track width from the corner point.