SEARCH PATTERNS BMCS WOLFSON

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(No Transcript)
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Search PatternsBMCS WOLFSON
HEH! IM OVER HERE !!!
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Nomenclature
Major Axis
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Nomenclature
Minor Axis
Major Axis
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Nomenclature
Minor Axis
Commence Search Point (CSP)
Major Axis
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Nomenclature
Minor Axis
(CSP) Plotted 1/2 Track space from corner!
Major Axis
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Nomenclature
Minor Axis
Search Leg
Major Axis
CSP
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Nomenclature
Cross leg will be equal to 1 whole track space!
Cross leg
Minor Axis
Major Axis
CSP
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Nomenclature
Track space
CSP
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Nomenclature
N
Direction of Creep
E
W
CSP
S
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Search Pattern Designations
First letter Pattern Type
P Parallel track V Sector C
Creeping line B Barrier S
Square T Trackline
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Search Pattern Designations
Second letter Number of Search Units
S Single unit M Multi-unit
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Search Pattern Designations
Third Letter Supplementary Information
N Non return L LORAN R Return or
C Coordinated Radar
or circle S Spiral
d Drift A Aural
compensated
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Which Search Patterndo I use?
Creeping line Sector
Trackline Parallel
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Ask yourself what is....

• datum
• search object
• search area
• search units
• on scene weather
• probability of detection

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Trackline Search

• Criteria
• Search objects intended track
• is the only information available.
• Rapid coverage of the search
• objects proposed track is obtainable.
• Usually the first physical search
• for a missing or overdue craft.

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Trackline Search

• Execution
• For patterns with an odd number of legs, CSP
  is at
• one end of the trackline.
• For patterns with an even
• number of legs CSP is offset
• 1/2 track space to either side.

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Trackline Search
Single Unit Non-Return
TSN
A
B
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Trackline Search
Single Unit Return
TSR
CSP
A
B
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Trackline Search
Origin
Drifted Trackline
Destination
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Trackline Search
Single Unit Return
TSR
CSP
1/2 S
1/2 S
1/2 S
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Parallel Search

• Criteria
• Used to cover large search areas.
• Provides uniform coverage.
• Usually the best pattern when using more
• than one search unit.
• Execution
• Search legs are parallel to the major axis.

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Parallel Search Single Unit (PS)
CSP
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Parallel Search Multi-Unit(PM)
CSP
CSP
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Parallel Search Single Unit (PS)
CSP
CSP
A-1
A-2
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Creeping Line Search
Criteria Provides uniform coverage of the
search area. Higher probability that the search
object is at one end of the area than the other.
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Creeping Line Search Single Unit (CS)
CSP
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Creeping Line Search Multi-Unit (CM)
CSP
CSP
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Creeping Line Search Single Unit (CSC)
CSP
CSP
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Expanding Square Search (SS)
Criteria

• Criteria
• Must have a good datum.
• Used in small search areas.
• Provides uniform coverage.

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Expanding Square Search

• Execution
• CSP is at datum
• First leg is down drift
• All turns are 90 degrees to the right
• Search leg length is increased by
• one track space on every other leg.

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Expanding SquarePattern (SS)
3
1
5
3
1 S
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4
2
4
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Expanding SquarePattern (SS)
6 NM Search Radius / 144 SQ. NM
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1
1 S
3
2
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SS, 1 NM, 12KTS
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Sector Search

• Criteria
• Must have good a datum.
• Used in small search areas.
• Small search objects

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Sector Search

• Execution
• CSP is at datum.
• First leg is down drift
• All turns are 120 degrees
• to the right.

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Sector Search Single Unit (VS)
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Sector SearchInitial search track
spacingsee page 2-F-3, Table 2-3 CG ADDENDUM
Track spacing (S) is equal to the radius.
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Sector Search Single Unit (VS)
Second Search Off set 30 degrees to the right
CSP
First search
CSP
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Barrier Search
Criteria Used where strong currents exist.
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Barrier Search

• Execution
• Major axis is perpendicular
• to the direction of drift.
• The SRU runs back and forth
• along the down current end
• of the search area.

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Barrier Search
X
Distress Position
Current
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Barrier Search
X
Distress Position
SRU
Current
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ANY QUESTIONS?
SAR PATTERNS