SAR Chapter 4 Answers to Review Questions

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SAR
Chapter 4 Answers to Questions
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Chapter 4 - Answers to Review Questions
1. What is the goal of Search Operations Planning?
To maximize the probability of success
2. Define Track Spacing.
Track Spacing is the distance between two
parallel legs
3. What is the standard Track Spacing for a
Coastal First Search under Good Conditions for an
Object gt 15 feet long?
1.0 Nautical Mile
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Chapter 4 - Answers to Review Questions
4. What is the standard Track Spacing for a
Coastal First Search for an Object gt 15ft if the
Wind is 12kts and the seas are gt 3ft?
0.5 Nautical Miles
5. What is the standard Track Spacing for a PIW?
0.1 NM up to the minimum ability to navigate
6. What is the standard Track Spacing for a
Coastal First Search for an Object gt 15ft if the
Wind is 18kts and the seas are lt 3ft?
0.5 Nautical Miles
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Chapter 4 - Answers to Review Questions
7. What is the formula that relates Velocity of
the SRU, S, and Time on Search, to Area Covered?
A V x S x T
8. If S is halved what happens to A?
A is reduced by one-half
9. If A and S stay the same but V is increased 20
times what happens to T?
T is reduced by a factor of 20
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Chapter 4 - Answers to Review Questions
10. How much area can a boat SRU cover in
remaining daylight of 4 hours at a speed of 9kts
using a track spacing of 1NM?
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36 NM
11. How long will it take a SRU searching at
8.5kts using an S of 1NM to cover 120NM
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14 hours 7 minutes
12. Define Sweep Width.
The distance on both sides of the SRU where the
probability of detecting the target outside the
sweep width is equal to the probability of
missing a target inside the distance
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Chapter 4 - Answers to Review Questions
13. What is the difference between Uncorrected
Sweep Width and Corrected Sweep Width?
Uncorrected Sweep Width corrected for Weather,
Crew Fatigue, and SRU Speed is Corrected Sweep
Width
14. What are the Factors used to correct
Uncorrected Sweep Width?
Weather, Crew Fatigue, and SRU Speed
15. Why are these Factors not used to correct
Radar Sweep Width?
RADAR Sweep Width is already corrected for
Weather, Crew Fatigue might have to be corrected
for
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Chapter 4 - Answers to Review Questions
16. What is the difference between the
Probability of Detection and Sweep Width?
Probability of Detection is a percentage number
that relates Track Spacing and Corrected Sweep
Width Sweep Width is a distance in miles where
the probability of missing a closer target is the
same as detecting a more distant target
17. What is the equation that relates Coverage
Factor to Track Spacing and Sweep Width?
Coverage Factor is equal to Sweep Width divided
by Track Spacing
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Chapter 4 - Answers to Review Questions
18. For a Coastal First Search, Aux Vessel SRU,
Fresh Crew, determine the Track Spacing,
Probability of Detection, and Time to search an
area of 120NM at a search speed of 10kts.
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a. Target 14 outboard. Winds 12kts. Seas 2
ft. Visibility 5NM
S0.5NM Wa 1.1NM fW0.5 W0.6NM
C1.2 POD85 T24 hours
b. Target 14 outboard. Winds 16kts. Seas 3
ft. Visibility 5NM
S0.2NM Wa 1.1NM W0.6NM C2.7
PODgt98 T60 hours
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Chapter 4 - Answers to Review Questions
19. If a SRU is dispatched on a Coastal First
Search and gets to the LKP (8 miles offshore) and
is unable to see the Target, and has had no
specific instructions from the SMC what should
the Coxswain do?
Commence an Expanding Square with first leg
downwind
20. In what direction should the first leg of an
Expanding Square pattern be run?
Directly downwind
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Chapter 4 - Answers to Review Questions
21. What does CSP stand for, and how is it used?
Commence Search Point. To control the path to the
search area and have the search start at the
point the SMC desires
22. Define Search Leg, Cross Leg, and Creep.
Search Leg is the long leg of the pattern Cross
leg is the legs that connect the long legs Creep
is the general direction of travel
23. Describe the four methods of specifying
Search Area.
Boundary Corner Points Center Track Line
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Chapter 4 - Answers to Review Questions
24. Describe the TSR pattern and when might it be
the most appropriate pattern.
Trackline, Single Unit, Return. When departure
and destination points are known
25. While searching for a PIW, several SRUs
travel line abreast 200 yds apart with one SRU
doing all of the navigation. What is this pattern
called?
PM
26. Which patterns can be run with a LORAN
reference?
Any!
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Chapter 4 - Answers to Review Questions
27. Why is leeway of the SRU important?
The actual pattern made good might not be where
the SMC wishes
28. What is the Heading Change to compensate for
leeway for a boat with Aa220ft2, an Aw 90ft2,
at a searching speed of 8kts in a relative wind
of 15kts with a flag angle of 45º?
4º into the wind
29. What is the Heading Change to compensate for
leeway for a boat with Aa 240ft2 , an Aw
95ft2 , at a searching speed of 7kts in a
relative wind of 13kts with a flag angle of 120?
5º into the wind
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Chapter 4 - Answers to Review Questions
30. When there are several SRUs on scene to whom
do they report?
To the On-Scene Commander (OSC)
31. What happens to the SMC assignment if a SRU,
reporting to a Station, gets to the LKP and does
not find the Object?
SMC is transferred to Group or to RCC
32. If the Search Area is 144NM2, the Track
Spacing is 0.5NM, and the SRU Speed is 10kts, how
many SRUs does the SMC need if he needs to
complete the search in 6 hours?
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Chapter 4 - Answers to Review Questions
33. If the Auxiliary SRU completes his assigned
search area, which is part of a larger search
area, to whom does he report?
To the On-Scene Commander (OSC)
34. Is an Auxiliary Facility ever likely to be
assigned OSC? Why?
No. Auxiliary vessels do not have the room,
equip-ment, crew, or endurance to qualify to act
as OSC
35. What is the Corrected Sweep Width for a
32CC, in a 20Kt Wind, with Visibility 10NM, for
a SRU with a tired Crew?
4.7 x .9 x .9 3.8NM
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Chapter 4 - Answers to Review Questions
36. What is the Corrected Sweep Width for a
10-person Raft, in 18Kt Wind, with Visibility
5NM, for a fresh SRU crew?
2.8 x 1.0 x 0.5 1.4NM
37. Use the Expanding Square Worksheet. If S1NM,
Speed is 10Kts, and the Start is at 1430, at what
clock time does the 5th leg commence? the 8th leg
commence?
5th leg commences at 1506 8th leg commences at
1606
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Chapter 4 - Answers to Review Questions
38. Use the Sector Worksheet. If R 2NM, Speed
is 12Kts, and the Start at Datum is at 1150, at
what clock time does the 4th leg commence? At
what clock time does the SRU pass through Datum
after the 5th leg?
4th leg commences at 1230 SRU passes through
Datum at 1250 after the 5th leg
39. For a rectangular Search Area when is the CS
pattern used instead of a PS pattern?
When the SMC decides to search one end first
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Chapter 4 Answers to Questions