Stationing

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Stationing
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Lesson Overview

• Change of Station Terms
• Guide
• Base Course/Speed
• Stationing Speed
• Stationing Rules

• Stationing Problems
• Guide in center
• Guide out of center
• Doglegs

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Change of Station Terms

• Guide
• ship we are maneuvering in relationship to
• reference ship
• course and speed usually known or given
• always on station
• Whats different?
• er vector -- guides course and speed

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Change of Station Terms

• Base Course / Speed (B CORPEN / SPEED)
• course and speed the guide should be on
• er vector
• also the course and speed you should be on when
  you are on station

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Change of Station Terms

• Stationing Speed (if given) (S SPEED)
• speed you should be using if you are not on
  station
• normally faster than base speed

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Stationing Rules

• When changing station
• avoid other ships that have right of way
• ships engaged in
• minesweeping
• flight operations, or
• underway replenishment
• ships in the main body
• ships in the screen

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Stationing Rules

• When changing station
• avoid dipping helos by 500yds
• dont hit other ships in the formation
• avoid other ships by 1000 yds, try to pass astern

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Stationing Rules

• When changing station
• for aircraft carriers obey the 3-2-1 rule
• pass no closer than 3000 yds ahead, 2000 yds
  abeam, or 1000 yds astern
• junior ships stay clear of senior ships

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Stationing Problems

• Two ways to do stationing problems
• Guide in the center
• Guide out of the center

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GuideInCenter
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Change of Station(Guide in Center) Setup

• Information you NEED to know
• Course and Speed of Guide (er vector)
• Where are you? (in relation to the guide) (M1)
• Where are you going? (in relation to the guide)
  (M2)
• Any constraints?

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Change of Station(Guide in Center) Setup

• Constraints
• Stationing Speed (speed given)
• Be on station NLT (time given)
• Use course to get on station (course given)

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Change of Station(Guide in Center) Setup

• 1. Plot guides course and speed.

270 15kts
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Change of Station(Guide in Center) Setup

• 2. Plot your position (M1).

M1
Guide bears 180 4,000yds
180 4,000yds
You bear 000 4,000yds FROM the guide
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Change of Station(Guide in Center) Setup

• 3. Plot where you are supposed to go. (M2)

M1
Take station 1,000yds astern (180R)
M2
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Change of Station(Guide in Center) Setup

• 4. Connect the dots. (DRM)

M1
M2
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Change of Station(Guide in Center) Setup

• 5. Parallel this DRM to the er vector.

M1
M2
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Change of Station(Guide in Center) Setup

• This rm vector represents all the possible
  courses and speeds you can use to get on station.

We now have to apply the constraints.
rm
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Change of Station(Speed Given)

• 6. Find the point where the rm vector crosses the
  speed ring.

Then compute the time you will be on station.
Stationing Speed 18kts
220 18kts
rm
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Change of Station(Course Given)

• 6. Find the point where the desired course
  intersects the rm vector.

Then compute the time you will be on station.
Course 260
260 14.5kts
rm
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Change of Station(Time Given)

• 6. Find the required relative speed by using the
  nomogram. You know time, you can find distance
  by measuring the distance between M1 and M2.

M1
Be on station in 30 minutes.
4,100yds
M2
rm
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Change of Station(Time Given)

• 7. Mark off the relative speed on the rm vector
  and read off the em vector.

SRM 4kts
255 14.5kts
rm
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GuideOut ofCenter
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Change of Station(Guide out of Center) Setup

• Information you NEED to know
• Course and Speed of Guide (er vector)
• Where is the guide? (M1)
• Where is the guide when on station? (M2)
• Any constraints?

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Change of Station(Guide out of Center) Setup

• 1. Plot guides course and speed.

270 15kts
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Change of Station(Guide out of Center) Setup

• 2. Plot guides position (M1).

Guide bears 180 4,000yds
180 4,000yds
M1
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Change of Station(Guide out of Center) Setup

• 3. Plot where the guide is supposed to go. (M2)

Take station 1,000yds astern (180R)
M2
M1
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Change of Station(Guide out of Center) Setup

• 4. Connect the dots. (DRM)

M2
M1
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Change of Station(Guide out of Center) Setup

• 5. Parallel this DRM in the OPPOSITE direction to
  the er vector.

M2
M1
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Change of Station(Guide out of Center) Setup

• This rm vector represents all the possible
  courses and speeds you can use to get on station.

Notice The relative plot is different, the speed
triangle is identical to guide in center. The
remainder of the problem is identical
rm
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Doglegs
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What if?

• Guide bears
• 180 4,000yds.

M1
Take station 270R 4,000yds from guide
Left standard rudder, steady course 240. All
engines ahead standard indicate turns for
17.5kts!
270 15kts
240 17.5kts
All hands brace for collision!
M2
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Doglegs

• Used to avoid colliding with other ships while
  changing station.

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Dogleg Setup(Guide in Center)

• 1. Plot guides course and speed.

270 15kts
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Dogleg Setup(Guide in Center)

• 2. Plot your position. (M1)

M1
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Dogleg Setup(Guide in Center)

• 3. Plot where you are supposed to go. (M3)

M1
M3
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Dogleg Setup(Guide in Center)

• 4. Pick an arbitrary point between M1 and M3. (M2)

M1
M2
M3
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Dogleg Setup(Guide in Center)

• 5. Connect the dots.

M1
M2
M3
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Dogleg Solution(Guide in Center)

• 6. Solve the course and speed for each leg as an
  independent change of station problem.

M2
M3
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QUESTIONS ????