NS100

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NS100

• Fundamentals of
• Naval Science

Anchoring Procedures
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Objectives
1. Describe the different types of anchors. 2.
Explain the function of detachable links, chain
stoppers, and the anchor windlass. 3. Outline
the steps in preparing to anchor, including all
events leading to the anchoring, readying the
anchor, and letting go the anchor. 4. Recite
standard commands used in anchoring evolutions.
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Objectives
5. Describe the procedure for weighing
anchor. 6. List two methods for mooring to
buoy.
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Ground Tackle
Collective term applied to all equipment used in
anchoring. Includes Anchor chain Connecting
fittings Anchor windlass other gear
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Anchors
Stockless Navy standard
Danforth On board YPs
Mushroom Permanent Anchorages
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Chain Measurement

• 1 shot 15 fathoms (1 fathom 6 feet)
• YP 1 shot 15 feet

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Anchor Chain Markings
Shot Color of of White Turns
Detachable Adjacent of Link
Links Wire
1 (15 fathoms) 2 (30 fathoms) 3 (45 fathoms) 4
(60 fathoms) 5 (75 fathoms) 6 (90 fathoms)
red 1 1 white
2 2 blue 3 3 red
4 4 white 5 5 blue
6 6
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Color Codes

• Detachable link Red, White, Blue, Red . . .
• Adjacent links white links on either side
  of shot

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Color Example

• 3rd shot W/W/W/B/W/W/W
• Second to last shot entirely yellow
• Last shot entirely red

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Detachable Link
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Chain Stopper
Detachable Link
Pelican Hook
Shackle
Turnbuckle
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Anchor Windlass
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Capstan
Dead man switch
Brake
Gypsy head
Wildcat
Housing Stopper
Riding Stopper
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Techniques of Anchoring
1. Preparation. - prior to anchoring,
determine a. Which anchor to use b. Depth of
water at anchorage c. Range of tide d. Type
of bottom e. Scope of chain required 2.
Inspection of equipment
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Techniques of Anchoring
3. Readying the anchor. Bridge Make the
anchor ready for letting go. Focsle Anchor
ready for letting go. - All equipment is given
a final check 4. Standing by to let go. -
Brake and clutch released. Bridge Standby to
let go the anchor Focsle Standing by to let
go
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Techniques of Anchoring
5. Letting go Bridge Let go the anchor - The
pin is pulled from the stoppers pelican hook,
and a sledge is used to free the hook, releasing
the anchor. - Focsle commences reports to the
bridge - amount of chain out - amount of
strain - if the anchor is holding or not
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Techniques of Anchoring
6. Desired scope - much of the holding power of
an anchor derives from the amount of chain on the
bottom. - Rule of thumb 5-7 times the depth of
water. - A lesser amount of chain is put out at
first to set the anchor.
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AT SHORT STAY
Length of chain
Almost
Depth of water
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UP AND DOWN
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AWEIGH
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Weighing Anchor
6. Housing and securing. - Housed with shank
in the hawsepipe, flukes against the ships side,
and strain equalized between the stoppers.
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Mooring to a Buoy
1. Dip Rope Method - The buoy party attaches
the buoy wire, then passes the messenger
through the eye of the buoy and attaches it to
the dip rope. The dip rope is connected to the
end of the anchor chain and by pulling on the
messenger, the anchor chain is pulled to the
buoy. 2. Trolley Method - A trolley is attached
to the buoy wire and used to ease the anchor
down to the buoy.
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Dip Rope Method
Buoy Wire
61
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Dip Rope Method
Buoy Wire
Messenger
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Dip Rope
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Dip Rope Method
Messenger
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Buoy wire
Anchor chain
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Trolley Method
Trolley
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Review Questions
1. Name three types of anchors. 2. What would
be the color scheme for the fifth shot of
chain? 3. What is the purpose of the riding
stopper? 4. What are two methods of mooring to
a buoy?