United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 1 / 18

Welcome to the

United States Power Squadrons'

Chart Smart Seminar

Piloting - Distance, Speed, Time(Section 6)

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 2 / 18

Class Agenda - cont'd

Section 5: Piloting - Distance, Speed, Time

• The DST Formula

• Alternative Method of Using 60D=ST

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 3 / 18

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 4 / 18

THE 60 x D = S x T FORMULA

D = Distance (in nautical miles - nm)

S = Speed (in knots - kn)

T = Time (in minutes - m)

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 5 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 6 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 7 / 18

Distance Measurement - "Walking" the Dividers

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 8 / 18

D 11.2

Labeling a Course Line For Distance

C 067

Course 067° trueDistance to next objective 11.2 nautical miles

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 9 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 10 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 11 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 12 / 18

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°)

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 13 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 14 / 18

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 15 / 18

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

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 16 / 18

Calculating Time

Arrive:

Depart:

Elapsed Time:

1612

1047

1572

1047

0525 (5h 25m)

———

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 17 / 18

Calculating Time

Depart:

Elapsed Time:

Arrive:

2200

1030

0830 (next day)

3230

- 2400

———

United States Power Squadrons® Chart Smart®

USPS ® America's Boating Club ® 18 / 18

End of Section 6

Piloting - Distance, Speed, Time