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Flashcards in Piloting & Navigation Deck (30):
1

The datum used for soundings on charts of the East Coast of the United States is...

A. Mean low water springs

B. Mean low water

C. Mean lower low water

D. Half tide level

C. Mean lower low water

2

Which term refers to the direction a current is flowing?

A. Set

B. Drift

C. Vector direction

D. Stand

A. Set

3

The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as...

A. Set

B. Frequency

C. Period

D. Function

B. Period

4

If you observe a buoy off station you should...

A. Fill out and mail CG Form 2692 to the nearest Coast Guard office

B. Appear in person at the nearest Coast Guard office

C. Notify Coast Guard Headquarters in Washington, D.C.

D. Immediately contact the nearest Coast Guard office by radiophone

D. Immediately contact the nearest Coast Guard office by radiophone

5

A nun buoy will...

A. Be green in color

B. Have an even number

C. Be left to port when entering from seaward

D. Be cylindrical in shape

B. Have an even number

6

The difference between the heights of low and high tide is the...

A. Period

B. Range

C. Distance

D. Depth

B. Range

7

By paying out more anchor cable, you_________.

A. decrease the holding power of your anchor

B. decrease the swing of your vessel while at anchor

C. increase the holding power of your anchor

D. increase the possibility that your vessel will drag anchor

C. increase the holding power of your anchor

8

On a Mercator chart, 1 nautical mile is equal to...

A. 1 minute longitude

B. 1 degree of longitude

C. 1 minute of latitude

D 1 degree of latitude

C. 1 minute of latitude

9

The term “flood Current” refers to that time when the water...

A. Is flowing towards land

B. Is moving towards the ocean

C. Level is not changing

D. Level is rising because of heavy rains

A. Is flowing towards land

10

In the U.S. Aids to Navigation System, red and green horizontally banded buoys mark...

A. Channels for shallow draft vessels

B. General anchorage areas

C. Fishing grounds

D. Junctions or bifurcation

D. Junctions or bifurcation

11

If several fixed navigational lights are visible at the same time, each one may be positively identified by checking all of the following except what against the Light List?

A. Rhythm

B. Period

C. Intensity

D. Color

C. Intensity

12

To safely anchor a vessel there must be sufficient "scope" in the anchor cable.  Scope is the ratio of_______________.

A. Weight of cable to weight of vessel

B. Weight of cable to weight of anchor

C. Length of anchor to depth of water

D. Length of cable to depth of water

D. Length of cable to depth of water

13

The four standard light colors used for lighted aids to navigation are red, green, white, and...

A. Purple

B. Orange

C. Blue

D. Yellow

D. Yellow

14

The lubber’s line on a magnetic compass indicates__________.

A. compass north

B. the direction in which the boat's bow is heading.

C. magnetic north

D. a relative bearing taken with an azimuth circle

B. the direction in which the boat's bow is heading.

15

What would give the best radar echo?

A. A 600-foot freighter, beam on.

B. The beam of a three masted sailing vessel with all sail set.

C. A 100-foot fishing vessel with a radar reflector in its rigging.

D. A 300-foot tanker, bow on.

A. A 600-foot freighter, beam on.

16

Red sectors of navigational lights warn mariners of...

A. Floating debris

B. Heavily trafficked areas

C. Recently sunken vessels

D. Shoals or nearby land

D. Shoals or nearby land

17

The difference in degrees between true north and magnetic north is called....

A. Variation

B. Deviation

C. Drift

D. PSC

A. Variation

18

The best method to stop a vessel from dragging anchor in a  sand bottom is to _________.

A. reduce the length of the cable

B. pay out more anchor cable

C. back the engines

D. swing the rudder several times to work the anchor into the  bottom

B. pay out more anchor cable

19

The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as...

A. Set

B. Frequency

C. Period

D. Function

C. Period

20

Which buoy may be odd numbered?

A. A spherical buoy

B. Unlighted can buoy

C. A red buoy

D. A yellow buoy

B. Unlighted can buoy

21

How many high waters usually occur each day on the East Coast of the United States?

A. One

B. Two

C. Three

D. Four

B. Two

22

In the U.S. Aids to Navigation System, red and green horizontally banded buoys mark...

A. Channels for shallow draft vessels

B. General anchorage areas

C. Fishing grounds

D. Junctions or bifurcation

D. Junctions or bifurcation

23

A nun buoy will...

A. Be green in color

B. Have an even number

C. Be left to port when entering from seaward

D. Be cylindrical in shape

B. Have an even number

24

Private aids to navigation in or along navigable waters of the United States may be listed in the...

A. Sailing Directions

B. Light List

C. List of Private Aids

D. Aids to Navigation Manual

B. Light List

25

Your vessel goes aground in soft mud. You would have the best chance of refloating it on the next tide if it grounded at...

A. Low water neap

B. Low water spring

C. High water neap

D. High water spring

B. Low water spring

26

What should you apply to a Fathometer reading to determine the depth of water?

A. Subtract the draft of the vessel.

B. Add the draft of the vessel.

C. Subtract the sea water correction.

D. Add the sea water correction.

B. Add the draft of the vessel.

27

What are the characteristics of an isophase light?

A. 4 sec. Flash, 2 sec. Eclipse, 3 sec. Flash, 2 sec. eclipse

B. 2 sec. Flash, 5 sec eclipse

C. 1 sec. Flash, 1 sec. Eclipse

D. 6 sec. Flash, 3 sec. Eclipse

C. 1 sec. Flash, 1 sec. Eclipse

28

Red sectors of navigational lights warn mariners of...

A. Floating debris

B. Heavily trafficked areas

C. Recently sunken vessels

D. Shoals or nearby land

D. Shoals or nearby land

29

The light rhythm of Morse (A) is shown on...

A. Preferred-channel buoys

B. Starboard or port-side buoys

C. Special marks

D. Safe water buoys

D. Safe water buoys

30

Which information does the outer ring of a compass rose on a nautical chart provide?

A. Variation

B. True directions

C. Magnetic directions

D. Annual rate of variation change

B. True directions