Navigation

Question 1

The diameter through the equater is about _____ nautical miles longer than is the diameter through the North and South poles.

Answer 1

23

Question 2

A ______ is geometric plane passing through the center of the earth, which divides the earth into two equal parts.

Answer 2

Great Circle

Question 3

How large is the earth’s circumference?

Answer 3

21,600 nm

Question 4

In every degree of arc in a circle, there are how many minutes?

Answer 4

60

Question 5

For every minute of arc in a circle, there are how many seconds?

Answer 5

60

Question 6

Parallel circles on the surface of the earth moving from the equator to the North or South pole?

Answer 6

Latitude

Question 7

One degree of latitude is equal to how many nautical miles?

Answer 7

60

Question 8

One minute of latitude is equal to how many nautical miles?

Answer 8

One

Question 9

For normal boat navigation, what type of chart projection is used?

Answer 9

Mercator

Question 10

When measuring distance in navigation always use what scale?

Answer 10

Latitude

Question 11

A degree of longitude is only equal to 60 miles where?

Answer 11

At the equator

Question 12

The prime meridian is 000 degrees and passes through where?

Answer 12

Greenwich, England

Question 13

The 180 degree meridian is known as?

Answer 13

International Date Line

Question 14

An imaginary line that intersects all meridians at the same angle?

Answer 14

Rhumb line

Question 15

What are the 2 basic types of projections?

Answer 15

Mercator and Gnomonic

Question 16

The difference between true and magnetic north?

Answer 16

Variation

Question 17

Number on the chart represent soundings of the water depth at what tide?

Answer 17

Mean low tide

Question 18

Tidal datum that is the average of all the low water heights observed over the National Tidal Datum Epoch (19 year average)?

Answer 18

Mean low water

Question 19

Tidal datum that is the average of the lowest low water height of each tidal day observed over the National Tidal Datum Epoch (19 year average)?

Answer 19

Mean lower low water

Question 20

Also known as fathom curves, these lines connect points of roughly equal depth and provide a profile of the bottom?

Answer 20

Contour lines

Question 21

General chart scales are between?

Answer 21

1:150,000 to 1:600,000

Question 22

Coastal Charts are produced at scales between?

Answer 22

1:50,000 and 1:150,000

Question 23

Harbor charts are produced at scales larger than?

Answer 23

1:50,000

Question 24

Small craft charts are produced at scales?

Answer 24

1:40,000 or larger

Question 25

All slanted roman lettering on the chart is used to label what information?

Answer 25

All information affected by tidal change or current

Question 26

Which color ink is used for most information on a chart since it is easier to read under red light?

Answer 26

Magenta

Question 27

The line or mark scribed on the compass housing to indicate the direction in which the boat is heading?

Answer 27

Lubber's line

Question 28

The difference between magnetic and compass?

Answer 28

Deviation

Question 29

The angular diffference between a compass direction and its corresponding true direction?

Answer 29

Compass error

Question 30

Variation changes with the geological location of the boat and is caused by?

Answer 30

Earth's magnetic field

Question 31

\_\_\_\_\_\_\_\_ changes the boats heading, and is not affected by the geographic locatin of the boat.

Answer 31

Deviation

Question 32

"Swinging the ship" helps determine?

Answer 32

Deviation

Question 33

To correct the compass, you ____ easterly errors, and _____ westerly errors.

Answer 33

Subtract, Add

Question 34

Can Dead Men Vote Twice At Election

Answer 34

Compass, Deviation, Magnetic, Variation, True, Add Easterly errors

Question 35

This hand-held line is used for ascertaining the depth of water and consists of a line marked in fathoms and weight of 7 to 14 pounds?

Answer 35

Lead line

Question 36

What is the first fathom of a lead line marked by?

Answer 36

Wooden toggle

Question 37

Second mark on the lead line (2 fathoms)?

Answer 37

Two strips of leather

Question 38

Mark that indicates 3 fathoms and 13 fathoms on a lead line?

Answer 38

Three strips of leather

Question 39

Mark that indicates 5 fathoms and 15 fathoms?

Answer 39

One white rag

Question 40

Mark that indicates 7 fathoms and 17 fathoms on a lead line?

Answer 40

One red rag

Question 41

One strip of leather with a hole on a lead line indicates what depth?

Answer 41

10 fathoms

Question 42

20 fathoms on a lead line is indicated by?

Answer 42

Two knots

Question 43

25 fathoms on a lead line is indicated by what?

Answer 43

One knot

Question 44

What is inserted at the bottom of the lead line to help gather samples of the sea bottom?

Answer 44

Tallow

Question 45

If a boat is traveling 10kts, how far will it travel in 20 mintues?

Answer 45

3.3 NM

Question 46

Speed, Time, Distance formula?

Answer 46

60 D = S x T

Question 47

The actual direction that boat's bow is pointing at any given time?

Answer 47

Heading

Question 48

Line drawn on a chart goin in one direction of a course?

Answer 48

Course line

Question 49

The approximate position by advancing a previous position for course and distance only, without regard to other factors such as wind, current, and sea conditions?

Answer 49

Dead reckoning

Question 50

A DR position modified by additional information, which in itself is insufficient to establish a fix?

Answer 50

Estimated position

Question 51

A line of bearing to known object, which a vessel is presumed to be located on at some point?

Answer 51

Line of position

Question 52

A position determined from terrestrial, electronic or celestial data at a given time with a high degree of accuracy?

Answer 52

Fix

Question 53

A position determined by crossing LOPs obtained at different times?

Answer 53

Running fix

Question 54

How many feet are in a nautical mile?

Answer 54

6,076 ft

Question 55

The average speed in knots that must be maintained to arrive at a destination at any appointed time?

Answer 55

Speed of advance

Question 56

The speed of travel of a boat along the track, expressed in knots?

Answer 56

Speed made good

Question 57

A course followed on intended to be followed by a boat?

Answer 57

Track

Question 58

The direction toward which the current is flowing expressed in degrees true?

Answer 58

Set

Question 59

The speed of the current usually stated in knots?

Answer 59

Drift

Question 60

Visual fixes on a chart are marked with?

Answer 60

Circle and time

Question 61

Electronic fixes on a chart are marked by?

Answer 61

Triangle and time

Question 62

DR positions are marked by?

Answer 62

Semi-circle and time

Question 63

Estimated positions are marked by?

Answer 63

Square and time

Question 64

A DR should be plotted when?

Answer 64

Every hour on the hour, every course change, every speed change, every fix or running fix, every bearing, and anything unusual.

Question 65

A error of 1 degree at 1 mile will result in an error of?

Answer 65

100 ft

Question 66

An ideal fix has how many LOPs?

Answer 66

3

Question 67

LOP's should have a seperation of at least \_\_\_, but not more than \_\_\_?

Answer 67

60 degrees, 120 degrees

Question 68

The shorter the time interval between LOPs, the more ___ the running fix?

Answer 68

Accurate

Question 69

Advancing a LOP for more than ___ minutes should be avoided?

Answer 69

30 minutes

Question 70

Bearing used to keep a boat clear of hazardous areas in the vicinity of the track?

Answer 70

Danger bearings

Question 71

Which fix is more reliable, visual or electronic?

Answer 71

Visual

Question 72

The GPS is radio navigation system of how many DoD operated satellites?

Answer 72

24

Question 73

GPS provides what two services?

Answer 73

SPS and PPS

Question 74

Standard Position Service is accurate to a radius within ___ meters 99% of the time?

Answer 74

33

Question 75

Precise Position System provides fixes accurate within ___ meters, and is limited to U.S. Federal government, allied military and civil users?

Answer 75

10

Question 76

A GPS receiver must compute the range of at least how many satelittes?

Answer 76

4

Question 77

What does ECINS stand for?

Answer 77

Electronic Charted and Integrated Navigation System

Question 78

What does ECS stand for?

Answer 78

Electronic Chart System

Question 79

What does SINS stand for?

Answer 79

Scalable Integrated Navigation System

Question 80

What does ECDIS stand for?

Answer 80

Electronic Chart Display and Information System

Question 81

Adequate back up arrangements for ECINS shall be transferable in how many fix intervals?

Answer 81

One fix interval

Question 82

Manually entering visual and radar LOPs is considered what type of navigation?

Answer 82

Mode 2

Question 83

In restricted waters, you should compare the primary positioning source to a backup source when?

Answer 83

At least every thrid fix

Question 84

ECS is primarily used as a?

Answer 84

Situational awareness tool

Question 85

Primary navigation should be transferable to paper plot within how many fixes?

Answer 85

One

Question 86

Does SINS meet the standards for ECS?

Answer 86

No

Question 87

When plotting with paper charts, fixes shall be plotted no more than ___ minute intervals?

Answer 87

30

Question 88

When navigating within restricted waters, a fix shall be plotted a least every ___ minutes?

Answer 88

15

Question 89

Do boats using SINS or ECS with an adequate primary position source need to plot paper fixes?

Answer 89

No

Question 90

What form is compass deviation recorded on?

Answer 90

CG-2596