Search Patterns

•Sector Search Pattern

This pattern requires a -

oDATUM position

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oLEG LENGTH - given as a  distance (nm)

This pattern should not be split for multi-vessels

•Expanding Box Search Pattern

This pattern requires a -

oDATUM position

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oLEG LENGTH - given as a distance (nm)

This pattern can be split for a multi-vessel search

•Parallel Line Search Pattern

This pattern requires a -

oDATUM position

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oLEG LENGTH - given as a distance (nm)

oTRACK SPACING - given as a distance (nm)

This pattern can be split for a multi-vessel search

•Expanding Parallel Line Search Pattern

This pattern requires a -

oDATUM position and this must come from a previously calculated Datum so that we know where the LKP is

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oARC ANGLE (°)

oTRACK SPACING - given as a distance (nm)

This pattern can be split for a multi-vessel search

•Goal Keeper Search Pattern

This pattern requires a -

oDATUM position

oDISTANCE FROM DATUM (nm)

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oLEG LENGTH - given as a distance (nm)

This pattern will always be used by one vessel only

•Pendulum Search Pattern

This pattern requires a -

oDATUM position

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oLEG LENGTH - given as a distance (nm)

oTRACK SPACING - given as a distance (nm)

The shape of this pattern changes depending upon the relative lengths of the LEG LENGTH and the TRACK SPACING -

▪If the LEG LENGTH is longer than the TRACK SPACING, the pattern will progress quickly along the drift path.  This will be used for a faster moving casualty

▪If the LEG LENGTH is shorter than the TRACK SPACING, the pattern will widen in relation to the drift path.  This would be used for a slower moving casualty that is likely to diverge significantly

This pattern is ideal for a multi-vessel search

•ZigZag

This pattern requires a -

oDATUM position

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oLEG LENGTH - given as distance (nm)

oTRACK SPACING - given as a distance (nm)

This pattern can be split for a multi-vessel search

•Expanding ZigZag

This pattern requires a -

oDATUM position, and this must come from a previously calculated Datum so that we know where the LKP is

oDRIFT BEARING (°T)

oVessel SEARCH SPEED (kts) which is used only to estimate the length of time the legs of the pattern will take

oARC ANGLE (°)

oTRACK SPACING - given as a distance (nm)

This pattern can be split for a multi-vessel search

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