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NAVIGATION > MOBOARD > Flashcards

MOBOARD Flashcards

1
Q

Advance

A

The distance a vessel moves in its original direction after the helm is put over

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2
Q

Apparent Wind

A

The speed and true direction from which the wind appears to blow with reference to a moving point.

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3
Q

Circle Spacing

A

The distance in yards between successive whole numbered circles. Unless otherwise designated, it is always 1000 yards.

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4
Q

Cone of Course

A

Mathematically calculated limits, relative to datum, within which a submarine must be in order to intercept the torpedo danger zone

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5
Q

Course

A

Direction of actual movement relative to true north

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6
Q

Datum

A

The last known position of an enemy submarine at a specified time. (Lacking other knowledge this is the position and time of torpedoing)

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7
Q

Direction

A

The position of one point in space relative to another without reference to the distance between them

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8
Q

Direction of Relative Movement

A

(DRM) the direction of movement of the maneuvering ship relative to the reference ship; the direction of the relative movement line

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9
Q

Distance Circles

A

Circles concentric to the formation center, with radii of specified distances, used in the designation of main body stations in a circular formation. Circles are designated by means of their radii, in thousands of yards from the formation center. Thus, circle 5 is a circle whose radius is 5000 yards from the center, while circle 7.2, is a circle 7200 yards from the formation center

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10
Q

Distance is Relative Movement

A

(MRM) the distance along the relative movement line between any two specified points or times

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11
Q

Fictitious Ship

A

An imaginary ship, presumed to maintain constant course and speed, substituted for a maneuvering ship which alters course and speed

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12
Q

Formation Axis

A

An arbitrarily selected direction from which all bearings used in the designation of main body stations in a circular formation are measured. The formation axis is always indicated as a true direction from the formation center

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13
Q

Formation Center

A

The arbitrarily selected point of origin for the polar coordinate system, around which a circular formation is formed. It is designated station zero

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14
Q

Formation Guide

A

A ship designated by the OTC as guide, and with reference to which all ships in the formation maintain position. The guide may or may not be at the formation center

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15
Q

Geographical (navigational) plot

A

A plot of the actual movements of objects (ships) with respect to the earth

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16
Q

Limited Lines of Approach

A

Mathematically calculated limits, relative to the force, within which an attacking submarine must be in order that it can reach the torpedo danger zone

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17
Q

Maneuvering Ship

A

Any moving unit set up in the problem except the reference ship

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18
Q

Missile Danger Zone

A

An area which the submarine must enter in order to be within maximum effective missile firing range

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19
Q

Range

A

Distance between ships

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20
Q

Reference Ship

A

The ship to which the movement of others is referred

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21
Q

Relative Distance

A

(MRM) The distance along the relative movement line between any two specified points or times

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22
Q

Relative Movement

A

The motion of one ship relative to another

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23
Q

Relative Movement Line

A

The locus of positions occupied by the maneuvering ship relative to the reference ship

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24
Q

Relative Plot

A

The plot of the positions occupied by the maneuvering ship relative to the reference ship

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25
Q

Relative Vector

A

A velocity vector which depicts the relative movement of an object (ship) in motion with respect to another object (ship), usually in motion

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26
Q

Relative Wind

A

The speed and relative direction from which the wind appears to blow with reference to a moving point.

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27
Q

Screen Axis

A

An arbitrarily selected direction from which all bearings used in the designation of screen stations in a circular formation are measured. The screen axis is always indicated as a true direction from the screen center

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28
Q

Screen Center

A

The selected point of origin for the polar coordinate system, around which a screen is formed. The screen center usually coincides with the formation center, but may be a specified true bearing and distance from it

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29
Q

Screen Station Numbering

A

Screening stations are designated be means of a station number, consisting of four or more digits. The last three digits are the bearing of the screen station relative to the screen axis, while the prefixed digits indicate the radius of the distance circle in thousands of yards from the screen center

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30
Q

Speed of Relative Movement

A

(SRM) the speed of the maneuvering ship relative to the reference ship

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31
Q

Speed Triangle

A

The usual designation of the vector diagram when scaled in knots

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32
Q

Station Numbering

A

Positions in a circular formation (other than the formation center) are designated by means of a station number, consisting of four or more digits. The last three digits are the bearing of the station relative to the formation axis, while the prefixed digits indicate the radius of the distance circle in thousands of yards. Thus station 4090 indicates a position bearing 90 degrees relative to the formation axis on a distance circle with a radius of 4000 yards from the formation center. Station 10.2340 indicates a position 10200 yards from the formation center bearing 340 degrees relative to the axis

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33
Q

Timeline

A

A line joining the heads of two vectors which represent successive courses and speeds of a specific unit in passing from an initial to a final position in known time, via a specified intermediate point. This line also touches the head of a constructive unit which proceeds directly from the initial to the final position in the same time. By general usage this constructive unit is called the fictitious ship. The head of its vector divides the time line into segments inversely proportional to the times spent by the unit on the first and second legs. The time line is used in two course problems

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34
Q

Torpedo Danger Zone

A

An area which the submarine must enter in order to be within maximum effective torpedo firing range

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35
Q

Transfer

A

The distance a vessel moves perpendicular to its initial direction in making a turn

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36
Q

True Vector

A

A velocity vector which depicts actual movement with respect to the earth

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37
Q

True Wind

A

True direction and force of wind relative to a fixed point on the earth

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38
Q

Vector

A

A directed line segment representing direction and magnitude

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39
Q

Vector Diagram

A

A graphical means of adding and subtracting vectors. When the vector magnitude is scaled in knots, this diagram is usually called Speed Triangle

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40
Q

Velocity Vector

A

A vector the magnitude of which represents rate of movement; a velocity vector may be either true or relative depending upon whether it depicts actual movement with respect to the earth or the relative movement of an object (ship) in motion with respect to another object (ship)

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41
Q

Wind Direction

A

The direction from which the wind blows

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42
Q

Wind Speed

A

The rate of motion of air

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43
Q

CPA

A

Closest Point of Approach

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44
Q

CWC

A

Composite Warfare Commander

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45
Q

DRM

A

Direction of Relative Movement

46
Q

LLSuA

A

Limited Lines of Submerged Approach

47
Q

LLQA

A

Limited Lines of Quiet Approach

48
Q

LLSnA

A

Limited Lines of Snorkel Approach

49
Q

LLSA

A

Limited Lines of Surface Approach

50
Q

M

A

Maneuvering ship designation

51
Q

MRM

A

Miles of Relative Movement

52
Q

OTC

A

Officer of Tactical Command

53
Q

R

A

Reference ship designation

54
Q

RML

A

Relative Movement Line

55
Q

SRM

A

Speed of Relative Movement

56
Q

Relative Motion

A

Is motion with respect to an arbitrarily selected object

57
Q

True Motion

A

Is movement with respect to the earth

58
Q

e

A

Point of origin; fixed with respect to the earth

59
Q

er

A

Reference ship vector designation

60
Q

em

A

Maneuvering ship vector designation

61
Q

rm

A

Relative movement vector designation representing SRM and DRM; always plotted in the direction M1 - M2

62
Q

What are two types of bearings for indicating the direction of any object from another?

A

True Bearing

Relative Bearing

63
Q

What are two points of reference are used to indicate bearings that never change?

A

The geographic North Pole for true bearing and the bow of our ship for relative bearing

64
Q

True Bearing

A

Is the angular measurement between true north and the line of sight or line of bearing to an object. Always measured clockwise from north

65
Q

Relative Bearing

A

Is the angular measurement between own ships head and the line of bearing to an object. It’s always measured clockwise from own ships head to the line of bearing or line of sight

66
Q

What is the formula for calculating for True Bearing?

A

TB = RB + SH

TB = True Bearing
RB = Relative Bearing
SH = Ship Heading
67
Q

What is the formula for calculating REaltive Bearing?

A

RB = TB - SH

RB = Relative Bearing
TB = True Bearing
SH = Ship Heading
68
Q

What are your cardinal points?

A

North
South
East
West

69
Q

What are your intercardinal points?

A

Northwest
Northeast
Southwest
Southeast

70
Q

What is it called if it bears 000 degrees relative?

A

Dead Ahead

71
Q

What is it called if it bears 045 degrees relative?

A

Broad on the Starboard Bow

72
Q

What is it called when it bears 090 degrees relative?

A

Broad on the Starboard Beam

73
Q

What is it called when it bears 135 relative?

A

Broad on the Starboard Quarter

74
Q

What is it when it is bearing 180 degrees relative?

A

Dead Astern

75
Q

What is it when it bears 315 degrees relative?

A

Broad on the Port Bow

76
Q

What is it when it bears 270 degrees relative?

A

Broad on the Port Beam

77
Q

What is it if it bears 225 degrees relative?

A

Broad on the Port Quarter

78
Q

Target Angle

A

Is the relative bearing of your ship as seem from the target

79
Q

What is the formula for Target Angle?

A

TA = TB + 180 - TC

TA = Target Angle
TB = True Bearing
180 = Reciprocal Bearing
TC = Targets Course
80
Q

True or False

Motion is simply the movement of an object from one point to another

A

True

81
Q

The change in positions in relations to a fixed reference point on Earth is known as _____________ movement.

A

True or actual

82
Q

The movement that takes place between two ships when one or both are moving is known as ________________ movement

A

Relative

83
Q

Which of the following is an example or relative motion?

A. A train traveling from Miami to Chicago
B. A speeding auto passing a motorcycle
C. A ship sailing around the world
D. A person walking 5 miles
E. All the above
A

B

84
Q

Your own ship is on a course of 280 degrees true and lookout reports a contact bearing 350 degrees relative. What is the true bearing of the contact?

A

270 degrees true

85
Q

Your course is 70 degrees true. Lookout report has a contact broad on the port quarter. What is the true and relative bearing of the contact?

A

295 degrees true/225 degrees relative

86
Q

What is the reciprocal bearing of a contact that bears 260 degrees true?

A

080 degrees true

87
Q

A contact bears 020 degrees true from own ship and is on course 270 degrees true. What is the target angle?

A

290 degrees true

88
Q

The PPI scope is a presentation of _______________

A

Relative Motion

89
Q

What is the formula to find a vessels speed?

A

S = D / T

90
Q

If a ship travels 1500 yards in 5 minutes, what is it’s speed?

A

9kts

91
Q

What is the formula for finding a ships distance?

A

D = S x T

92
Q

If a ship travels 10 kts for 21 minutes, what is the distance will it have traveled?

A

7000 yards

93
Q

What is the formula for figuring out time?

A

T = D / S

94
Q

How long does it take a ship to travel 11200 yards at 14 kts?

A

24 minutes

95
Q

What is the specific purpose of a maneuvering board?

A

It is specifically designed for solving problems relative motion

96
Q

You are using the 2:1 scale for measuring distance. Each dot on the maneuvering board represents how many yards?

A

200

97
Q

What is the distance scale would give you the largest plot of a contact having a range of 28800 yards?

A

3:1

98
Q

What is the speed of a contact that travels 24000 yards in 40 minutes?

A

18kts

99
Q

A contact traveling 12 kts in 25 minutes will travel a distance of ____________ yards.

A

10000

100
Q

A contact that traveled at a speed of 16 kts and reached a distance of 32000 yards made its destination in ________________ minutes

A

60 minutes

101
Q

The length of er vector represents own ships ______________

A

Speed

102
Q

The initial mark of a contract is called _____________

A

M1

103
Q

CBDR

A

Constant Bearing Decreasing Range

104
Q

PAO

A

Past and Opening

105
Q

What is determined by this paralleling a contacts relative movement line (RML) to the center of the maneuvering board?

A

DRM

106
Q

The measured distance and elapsed time between the marks M1 and M2 determines the _______________

A

SRM

107
Q

True or False

All vectors originate from the center of the maneuvering board?

A

True

108
Q

The direction of relative movement (DRM) and the r-m vector are always drawn __________________

A

The same as the e-r vector

109
Q

In the vector diagram, the direction of relative movement (DRM) and the speed of relative movement (SRM) determines the length and direction of the _______________ vector

A

r-m

110
Q

Dead Time

A

Is the time between the time you decide to execute a maneuver and the actual time you begin the maneuver

111
Q

MX

A

The point of execution for a maneuver on a MOBOARD

NAVIGATION (2 decks)

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