24 Piloting Procdurs

8/8/2019 24 Piloting Procdurs

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Navigation

NAU 102

Lesson 24


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Piloting Procedures

Piloting involves navigating a vessel inrestricted waters and fixing its position as

precisely as possible at frequent intervals.

Extra precaution is required due to nearby

hazards.

Shallow water, rocks, etc.

Manmade features

Little room to recover from navigation errors.


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Piloting Procedures

Careful preparation and detailed planning isnecessary.

Always use the largest scale chart available.

Corrected up to the latest

Notice to Mariners


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Piloting Procedures

Careful preparation and detailed planning isnecessary.

Highlight navigation hazards

Mark the minimum depth contour.

Minimum Depth = Ships Draft Height of

Tide + Safety Margin.


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Piloting Procedures

Minimum Depth = Ships Draft Height of

Tide + Safety Margin.

Minimum Depth =

16 ft 2 ft + 6 ft.

Minimum Depth =

20 ft.


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Piloting Procedures

Highlight navigation aids

Visual navigation

aids

Radar navigation

aids


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Piloting Procedures

Plot and label

the track line


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Piloting Procedures

Determine wheel-over points

WP 10

Bad

Rock

Ships dont make

sharp turns despite

what the DR plotlooks like.

Bear

Rock


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Piloting Procedures

Important Terms

Advance - the distance gained in the original

direction until the vessel steadies on her newcourse.

Transfer - the distance gained at right anglesto the original course, measured from the line

representing the original direction of travel to the

point of completion of the turn.


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Piloting Procedures

Right 15 rudder,

steady course

075

Steady on course

075Advance

Transfer


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Piloting Procedures

Ship Maneuvering Characteristics

Determined during sea trials

Required to be posted on the bridge.


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Maneuvering Characteristics

Data is tabulatedAngle of

Turn

Advance Transfer Angle of

Turn

Advance Transfer

15 500 38 105 993 833

30 680 100 120 933 1013

45 827 207 135 827 1140

60 940 347 150 687 1247

75 1007 513 165 533 1413

90 1020 687 180 367 1500


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Danger Bearings


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Wheel-over point

When should I turn?

C

-005

Angle of turn = 45FittingRock

C-05

0 Angle of

Turn

Advance Transfer

45 827 207

Step 1 Draw a line

parallel to the original

course at a distance equal

to the transfer207 yds


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Wheel-over point

When should I turn?

C

-005

Angle of turn = 45Chris Rock

C-05

0 Angle ofTurn Advance Transfer

45 827 207

Step 3 Draw a lineperpendicular to your

course line

827 yds

Wheel-overpoint


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Wheel-over point

C

-005

Swansons

Rock

C-050

Wheel-over

point

Actual path

of travel


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Turn Bearing

C

-005

Fleytas

Rock

C-0

50

Wheel-over

point

A bearing

of a

prominent

navaidthat

indicates

the vesselis at the

wheel-over

point.

TB-070

T


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Turn Range

C

-005

The Rock

C-05

0

Wheel-over

point

The range

to a

prominent

navaidthat

indicates

the vesselis at the

wheel-over

point.

TR

-0

.5n

m


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Piloting Procedures

Plot danger bearings


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Danger Bearings

C

-010

Submerged

Rock

C-0

60

A line drawn from

a prominent

feature through

the point of

danger.

NLT

030

T

+

//////////////////////

//Bearings are

labeled Not More

Than (NMT)

or Not Less Than

(NLT)


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Introduction to Navigation

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24 Piloting Procdurs