welcome to the marine sar technical training course sar/marine sar technical... · if tdv is less...
TRANSCRIPT
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Welcome to the
Marine SAR Technical Training Course
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By the end of this training we want you to be able to:
o Read and interpret New Zealand marine charts for SAR planning purposes.
o Accurately plot positions on a chart using navigation charting instruments.
o Calculate Time/Speed/Distance.
o Plot courses, directions and distances on charts.
o Locate relevant information relating to tidal movements using tide predictions from LINZ and tidal diamonds.
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o Use Leeway Tables to calculate the leeway effect on any identified target.
o Identify the relationship between Sweep Width and Track Spacing to calculate Coverage Factor.
o Plot a Search Area Determination and understand the calculations relating to Total Drift Vector length.
o Plot a Search Area Determination for the different plotting scenarios of LKP(target adrift) –Track line Overdue –Position Uncertainty –Time uncertainty.
By the end of this training we want you to be able to:
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o Identify Probability of Detection using Coverage Factor and understand the relationship between single searches and multiple searches and the effect of different asset types or heights of eye.
o Understand and explain the relationship between Search Area, Time, Velocity and Track Spacing.
By the end of this training we want you to be able to:
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1 Charts
2 Plotting Positions
3 Calculations - Time, Speed & Distance
4 Tides
5 Leeway
6 Search Area Determination - Total Drift Vector
7 Coverage Factor
8 Search Area Determination - Trackline Overdue, Position Uncertainty, Time
9 Uncertainty
10 Probability of Detection
11 A = TVS
12 Assessment Activity
The days programme covers:
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In this order:
8.00 - 8.15 Welcome and introductions.
8.15 – 10.30 Charts, Plotting Positions, Calculations, Plotting Courses.
Morning Tea
11.00 – 12.30 Tides, Leeway, Coverage Factor
Lunch
1.30 – 2.30 SAD, SAC, POD, ATVS
2.30 – 3.15 Assessment
Afternoon Tea
3.00 – 4.00 Wrap up
4.00 – 4.45 Assessment re-sits as needed.
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Charts
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Chart InformationIncluding Title & Scale
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Tidal Diamond
LongitudeFrom North Pole To South Pole.Furthest apart at The Equator.DO NOT useto measuredistance!
LatitudeParallel with Equator.Equal distance aparteverywhere on Earth
1 degree Latitude= 60 Nm1 Minute= 1NM
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Compass RoseAlso on Plotting Tool
Place Centre over positionEnsure 0-180 line is perfectly alignedWith True North & SouthOr
90-270 line is perfectly aligned withLatitude line
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2:PLOTTINGPositions
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CalculationsTime – Speed - Distance
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PlottingCourses and Direction
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Tides
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LAT = Chart Datum
The tide state for chart depths
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Tide
Diamond
refers to
location on
chart
Hours before
or after High
Water
Direction water
is moving
TOWARDS
Rate (speed)
water is moving
(Nm per hour) in
Knots
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Leeway
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Search Area Determination
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Coverage Factor
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Search Area Determination
Trackline OverduePosition Uncertainty
Time Uncertainty
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If TDV is less than 8 Nautical miles then Radius of Plot (Which is boxed) is 6 NM
If TDV is greater than 8Nm then its TDV/8+6 = Radius (Which is boxed)
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Probability of Detection
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o To increase POD:
o Multiple searches of same area
o Reduce track spacing
o Aviation and maritime search of same area.
o C = 1
o POD 1st Search 79%
o POD 2nd Search 96%
o Cumulative POD Cm = n C1 + ……..Cn
Coverage Factor / Probability of Detection
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A = TVS
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o T = A / (V x S)
o V = A / (T x S)
o S = A / (T x V)
o A = Area to be searched in nm2
o T = Time in decimals of hours
o V = Velocity is the sum of speed of search vessels
o S = Track spacing in nm
Factors and Formulas
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Assessment