lesson 13 dr and current sailing
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Light
9
99 9
99
999 9 95 5
5
5
11 1111
1111
1111
11
6pa
FL 6s 58ft 9M
Tank
Long Point
20
20 2
020
20
20 212
0
20
20
2121
21 2121 2123 23 23 23 23 23
1515 15 1517
1717 1719
19 19 19
C- 085 TS - 12
080008
100810
Fundamentals ofNaval Science
Dead Reckoning and Current
Sailing
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Dead Reckoning• DR - Determining the position of a
vessel by adding to the last fix the ship’s true course and speed for a given time.
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Dead Reckoning• Uses:
– Determine when change course/speed– To predict the time of sighting lights and other aids to navigation
– Project future positions relative to hazards– Measure the effects of current (winds, seas)– Alter course to account the effects of current
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Plot a DR Position Every Hour on the Hour
09001000
1100
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Plot a DR Position atEvery Course Change
20
24
29C-125
c-090
C-080
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Plot a DR Position atEvery Speed Change
15 21 27
S-10 S-15 S-5
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Plot a DR Position for Every Line of Position (LOP)
Tank
0826
0826c-1
95s-1
0
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Plot a DR Position for Every Fix or Running Fix
46
0846
370937R-Fix
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0846c-106s-10 52
58
A new course line shall be drawn from every fix with 2 DRs
at your fix interval
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Typical DR plot
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Speed-Time-Distance Calculations • using a nautical slide rule,
electronic calculator, set of pre-computed tables, or speed nomogram.
D = S x T where: D = distance traveled S = speed in knots
T = time in hours
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Three Minute Rule In 3 minutes a vessel travels in yards a
distance 100 times its speed in knots. D = S x 100
where: D = distance traveled (yds) S = speed in knots
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Six Minute Rule In 6 minutes a vessel travels in miles a distance equal to its speed in knots divided by 10.
D = S / 10where: D = distance traveled (nm)
S = speed in knots
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Terms Used in Current Sailing Track (TR)
Speed of Advance (SOA) Course (C) Speed (S)
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Terms Used in Current Sailing
Set (S) Drift (D)
Course Made Good (CMG)Speed Made Good (SMG)
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Sensibility Check 1. Current pushing ahead, decrease speed.
2. Current pushing astern, increase speed.
3. Current pushing left, steer more to the right.
4. Current pushing right, steer more to the left.