ESWS DDG > ESWS NAVIGATION > Flashcards

ESWS NAVIGATION Flashcards

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1
Q

What is the radius of the swing circle?

A

The radius is equal to the sum of the ship’s length and the scope of the anchor chain released.

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2
Q

What is the purpose of the swing circle?

A

Used to check for navigational hazards.

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3
Q

What is the radius of the drag circle?

A

The radius equals the sum of the hawsepipe to pelorus distance and the scope of the chain released.

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4
Q

What is the purpose of the drag circle?

A

Used to ensure the anchor is holding.

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5
Q

What is a fix?

A

The ship’s position as determined by the navigator or QMOW.

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6
Q

What are the different types of fix?

A
  • Electronic (GPS/Radar)
  • Visual
  • Composite (Visual and Electronic combined)
  • DR (Dead Reckoning)
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7
Q

What is dead reckoning?

A

An educated guess of the ship’s position based on the last known position and the time, speed, and direction from that position.

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8
Q

What is a line of position (LOP)?

A

Lines or ranges taken from navaids that show the ship’s position at their intersection.

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9
Q

How many LOPs make up a fix?

A

3

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10
Q

How many LOPs from satellites does GPS use?

A

4

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11
Q

What are the two surface search radars on Gridley?

A
  • BME
  • SPS-67
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12
Q

How many military grade GPSs are on Gridley?

A

3

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13
Q

How many ship mounted GPSs are on Gridley?

A

2

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14
Q

How many hand-held GPSs are on Gridley?

A

1

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15
Q

What is the name of the hand-held GPS?

A

DAGR/Defense Advanced GPS Receiver.

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16
Q

What does WSN-7 provide?

A

Provides the ship’s gyro compasses and VMS with true heading.

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17
Q

What is the function of the INS?

A

Inertial Navigation Set - uses the ship’s heading and speed to determine where the ship is when GPS is unavailable.

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18
Q

What does DFGMC stand for?

A

Digital Fluxgate Magnetic Compass.

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19
Q

What is the DFGMC’s significance?

A

The ship’s only magnetic compass.

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20
Q

What is a stadimeter?

A

Instrument used by QMOW to identify range to an object once height of the object has been determined.

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21
Q

What does ECDIS-N stand for?

A

Electronic Chart Display and Information System Navy

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22
Q

What is the name of Gridley’s ECDIS system?

A

VMS/Voyage Management System

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23
Q

How many VMS stations are there?

A

5

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24
Q

Where is NAV1 located?

A

QMOW Chart Table

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25
Where is NAV2 located?
Chart Room
26
Where is NAV3 located?
CIC
27
Where is CONN1 located?
Starboard side of the pilot house
28
Where is CONN2 located?
Port side of the pilot house
29
What does VMS do?
Allows the navigation team to monitor the ship's voyage plan and all navigation sensors such as position, speed, and heading
30
What type of chart does VMS use?
DNC/Digital Nautical Chart
31
How many geographical regions are available on DNCs?
29
32
What region is Everett in?
26
33
What is the responsibility of the OOD?
Direct representative of the CO underway, responsible for the safe navigation of Gridley and all operations or evolutions taking place during their watch
34
What is the role of the JOOD?
Assistant to the Officer of the Deck
35
What is the CONN responsible for?
Giving speed and direction orders to the helmsman
36
What does QMOW stand for?
Quartermaster of the Watch
37
What are the responsibilities of the QMOW?
Direct representative of the navigator while he is not on the bridge, monitors Gridley's position, assists the Officer of the Deck in safe navigation, and is the signalman on watch
38
What does BMOW manage?
The helm, lee helm, and lookouts; makes 1MC announcements and keeps order on the bridge
39
What is the role of the HELM?
Steers the ship as directed by the CONN
40
What does the LEE HELM do?
Makes speed changes as directed by the CONN
41
What is a sextant used for?
To measure height of celestial objects (stars, moon, planets) to determine position at sea ## Footnote The sextant is a crucial instrument for navigators to establish their position using celestial navigation.
42
What does a bearing circle do?
Determines true/relative bearing to objects/vessels in true/relative degrees ## Footnote The bearing circle is typically situated atop a pelorus and is used by the Officer of the Deck (OOD) and Quartermaster of the Watch (QMOW).
43
What is a telescopic alidade?
A telescopic instrument used to determine true/relative bearing to objects/vessels in true/relative degrees ## Footnote Like the bearing circle, it is also placed atop a pelorus.
44
What type of charts are used for nautical navigation?
Nautical charts ## Footnote Nautical charts specifically deal with bathymetric and hydrographic information, unlike general maps that focus on land elevation.
45
What does a fathometer measure?
Depth of water beneath sonar dome ## Footnote The fathometer is used by the QMOW for bathymetric navigation and is located in sonar control on the onboard Gridley.
46
What is the Global Positioning System (GPS)?
A system providing accurate, continuous, worldwide, all-weather, common-grid, three-dimensional positioning and navigation information ## Footnote GPS relies on 24 satellites (21 active, 3 spare) in geosynchronous orbit.
47
What does AIS stand for and what is its purpose?
Automatic Identification System; shows position of any contact near Decatur that is also using AIS ## Footnote AIS enhances situational awareness for vessels by providing real-time location data.
48
What is the Integrated Bridge System (IBS)?
A system connecting all surface search radars, navigation sensors, VMS, AIS, steering and thrust control ## Footnote IBS provides bridge watch standers with enhanced tools for navigation.
49
What navigational lights are shown when a vessel is underway?
* Masthead (White/225°) * Range (White/225°) * Stern (White/135°) * Port (Red/112.5°) * Starboard (Green/112.5°) ## Footnote These lights are essential for visibility and identification of a vessel's status while at sea.
50
What lights are displayed when a vessel is in-port and moored?
* Fwd anchor light (White/360°) * Aft anchor light (White/360°) * Aircraft warning (Red/360°) ## Footnote These lights indicate the vessel's presence and status while docked.
51
What does a vessel engaged in special operations display?
Three all-round lights in a vertical line, red over white over red ## Footnote This configuration signifies that the vessel is involved in special operations.
52
What lights indicate a man overboard situation?
Two all-round lights in a vertical line, red over red flashing ## Footnote This alert is critical for safety and response measures.
53
What lights are shown for a vessel not under command?
Two all-round lights in a vertical line, red over red ## Footnote This indicates that the vessel cannot maneuver or respond to navigational commands.
54
What lights are used when a vessel is anchored?
* Same as in-port, moored * Additional lights to illuminate silhouette of vessel ## Footnote This enhances visibility for other vessels and safety at anchor.
55
What lights are displayed when a vessel is aground?
* Fwd anchor light * Aft anchor light * Two all-round lights in a vertical line, red over red ## Footnote These lights indicate the vessel's condition and alert nearby vessels.
56
What is the day shape used for a vessel at anchor?
One black ball ## Footnote Indicates that the vessel is at anchor.
57
What is the day shape for a vessel not under command?
Two black balls ## Footnote Signifies that the vessel cannot maneuver due to circumstances.
58
What is the day shape for a vessel restricted in ability to maneuver?
Ball diamond ball ## Footnote Indicates that the vessel has limitations in its maneuvering capabilities.
59
What is the day shape for a vessel aground?
Three black balls ## Footnote Signifies that the vessel is grounded.
60
What is the day shape for a vessel constrained by draft?
One black cylinder ## Footnote Indicates that the vessel's draft restricts its ability to navigate.
61
What is a stand-on vessel?
Has the right of way ## Footnote The vessel that must maintain its course and speed.
62
What is a give-way vessel?
Does not have the right of way ## Footnote The vessel that must yield to the stand-on vessel.
63
Define a crossing situation.
Two ships crossing in front of each other ## Footnote A scenario where vessels are on a collision course.
64
Define an overtaking situation.
A ship coming from 22.5º or more abaft the beam of another ship to pass it ## Footnote Indicates a specific angle of approach for overtaking.
65
What flag is used for refueling/ammo handling?
Bravo ## Footnote This flag indicates that the vessel is engaged in dangerous operations.
66
What flags/pennants are used for Senior Officer Present Afloat (SOPA)?
Desig, Pier #, Stbd pennant ## Footnote These flags identify the senior officer's presence and location.
67
What flag is used for personnel recall?
Papa ## Footnote This flag signals the recall of personnel aboard the ship.
68
What is the code for BOAT RECALL in Quebec?
QUEBEC
69
What does the code ALPHA signify?
DIVERS
70
What is the code for personnel working aloft?
KILO
71
What does the code KILO 1 represent?
PERSONNEL WORKING OVER THE SIDE
72
What does the code KILO 3 signify?
PERSONNEL WORKING ALOFT AND OVER THE SIDE
73
What does HERO stand for?
HAZARDS OF ELECTRO-MAGNETIC RADIATION TO ORDNANCE
74
What is the meaning of the code INDIA?
READY TO RECEIVE SHIP ALONGSIDE INPORT
75
What is the code for MAN OVERBOARD?
OSCAR
76
What does the code UNIFORM represent?
ANCHORING
77
What does the 1st SUBSTITUTE pennant indicate?
ABSENCE OF A FLAG OFFICER OR UNIT COMMANDER WHOSE PERSONAL FLAG OR COMMAND PENNANT IS FLYING ON THIS SHIP
78
What does the 2nd SUBSTITUTE pennant signify?
ABSENCE OF CHIEF OF STAFF OR CHIEF STAFF OFFICER OF THE COMMANDER WHOSE PERSONAL FLAG IS FLYING ON THIS SHIP
79
What does the 3rd SUBSTITUTE pennant indicate?
ABSENCE OF CAPTAIN; SHIFTS TO EXECUTIVE OFFICER IF ABSENT FOR 72 HOURS OR MORE
80
What is signified by the 4th SUBSTITUTE pennant?
ABSENCE OF CIVIL OR MILITARY OFFICIAL WHOSE FLAG IS FLYING ON THIS SHIP
81
What is Transit passage?
The right of ships and aircraft to navigate international straits for continuous and expeditious transit between two areas of the high seas or exclusive economic zones
82
What is innocent passage?
The right of a foreign vessel to transit through another country's territorial sea without hindering the coastal state's peace, good order, or security
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