welcome to the united states power squadrons' chart smart seminar
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Welcome to the United States Power Squadrons' Chart Smart Seminar. Piloting - Distance, Speed, Time (Section 6). Section 5: Piloting - Distance, Speed, Time The DST Formula Alternative Method of Using 60D=ST. Class Agenda - cont'd. D = Distance (in nautical miles - nm). - PowerPoint PPT PresentationTRANSCRIPT
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Welcome to the
United States Power Squadrons'
Chart Smart Seminar
Piloting - Distance, Speed, Time(Section 6)
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Class Agenda - cont'd
Section 5: Piloting - Distance, Speed, Time
• The DST Formula
• Alternative Method of Using 60D=ST
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THE 60 x D = S x T FORMULA
D = Distance (in nautical miles - nm)
S = Speed (in knots - kn)
T = Time (in minutes - m)
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60 x D
S T
Alternative Method of Using the 60 x D = S x T Formula
S = 60 x D
T T =
60 x D
S D =
S x T
60
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Calculating Distance
How far will your boat go if you run at 10 knots for 30 minutes?
Formula: 60 x D = S x T 60 x D = 10 x 30 60 x D = 300 D = 5.0 nm
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Distance Measurement - "Walking" the Dividers
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D 11.2
Labeling a Course Line For Distance
C 067
Course 067° trueDistance to next objective 11.2 nautical miles
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D 11.2
Labeling a Course Line For Distance
C 247
Course 247° true (reciprocal of 067°)
Distance to next objective 11.2 nautical miles
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Calculating Speed
What was your boat speed if it took you 40 minutes to run 8 nautical miles?
Formula: 60 x D = S x T 60 x 8 = S x 40 480 = S x 40 S = 12.0 kn
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D 11.2
Labeling a Course Line For Speed
C 067
Course 067° true, Speed 12.0 knSpeed is placed beneath the course line and near the beginning of the course
S 12.0
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D 11.2
Labeling a Course Line For Speed
C 247
Speed is placed beneath the course line and near the beginning of the course
S 12.0
Course 247° true (reciprocal of 067°)
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Calculating Time
How long will it take you to go 5 nautical miles at 10 knots?
Formula: 60 x D = S x T 60 x 5 = 10 x T 300 = 10 x T T = 30 m
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1200
1400
1300
1500
1600
2300
2200
2100
2000
18001900 1700
0100
0200
0300
0400
0500
0600
0700
0800
0900
1000
1100
24000000
24 - Hour Clock
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Calculating Time
Arrive:
Depart:
Elapsed Time:
1612
1047
1572
1047
0525 (5h 25m)
———
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Calculating Time
Depart:
Elapsed Time:
Arrive:
2200
1030
0830 (next day)
3230
- 2400
———
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End of Section 6
Piloting - Distance, Speed, Time