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Flashcards in Exam 2 Deck (57):
1

The moon will rise approximately how many minutes later each night if you are at the same location?

50 minutes

2

What is the difference between a course line and a Trak line?

A course line is the intended direction of travel, always drawn as the true course on a chart.
A track line is the actual path of the vessel determined by plotting, which would be your course made good.

3

Only a single high and low water each title day is referred to as

Diurnal tide

4

Water takes time to build momentum to full speed and also takes time to reduce from full speed to be 0 kn

True

5

What factor has the greatest effect on title currents?

The moon

6

How do you mark an estimated position?

With a square

7

Can currents be caused by wind, rain, or the slope of land?

Absolutely

8

What is the bow and beam bearing rule?

45 to 90° relative taken on a fixed object to obtain a running fix. The length of the run between such bearings is equal to the distance of the craft from the object of the time the object is brought on the beam.

9

What is the Coriolis force?

Northern hemisphere to the right

10

Describe the stand of the tide

And interval at high or low water when there is no sensible change in the height of the tide

11

What is mixed tide?

Large inequality in the high and low water Heights

12

How much time is in a lunar day?

Approximately 24 hours and 50 minutes

13

What do you do to correct leeway?

Turn into the set

14

Tidal current is the____Movement of water and is caused by tide. Current is said to___

Horizontal; flood or Ebb

15

Speed along the track made good is the

Speed made good

16

If you were trying to take advantage of the higher high tide of a spring tide be sure to understand that

The low tide will be a lower tide

17

It’s always best to dock during slack tide.

True

18

Set is

The direction in which the current flows

19

What direction does wind come from?

From the direction it is named

20

What are characteristics of neap Tide?

These are tides of decreased range or speed, occur semi monthly, result of moon being in quadrature.

21

How do you mark a dead reckoning?

With the half circle

22

What is a rotary current?

The direction of flow is not restricted by land barriers and rotates through all points of the compass. They’re tidal currents that occur offshore away from land or harbor constrictions; the northern hemisphere is clockwise and the southern hemisphere is counterclockwise.

23

Current

A horizontal movement of water

24

How do you mark a fix?

With a circle

25

Range is

The difference in height between consecutive high and low waters

26

What is the term leeway used to account for?

The deviation from the course by wind

27

How do you mark an electronic fix?

With a triangle

28

Where does the gulf stream begin?

The Straits of Florida between the Florida Keys and Cuba

29

What is Tide?

The vertical rise and fall of water

30

Define Tide

The periodic rise and fall of the water resulting from gravitational interactions between the sun moon and earth

31

What is the 26.5 to 45° rule?

The distance run between bearings equals the distance off when a beam.

32

Where do diurnal tides occur?

The northern shore of the Gulf of Mexico, Java sea, gulf of Tonkin, and a few other locations

33

2 high and 2 low water each day is referred to as

Semidiurnal

34

What are some other determining factors and tidal currents?

Configuration of basin, friction, landmasses, inertia of water masses, Coriolis acceleration

35

How long is a lunar month?

29.5 days

36

Area of the sea surface over which seas are generated by a wind having a constant direction and speed is known as

Fetch

37

A ships actual position will be___from a dead reckoning position due to___

Different; current

38

What is a hydraulic current?

A current in a channel caused by a difference in the surface level at the two ends

39

Describe slack water

The period of time where water changes direction of flow i.e. has no current, and speed of the current is near zero.

40

What is leeway?

The angular difference between a vessels course in the track due to the effect of the wind moving a vessel bodily to leeward.

41

Wind is described as the direction it’s coming from.

True

42

What is the 7/10 rule?

States that the appropriate distance to an object brought on the beam equals 7/10 of the distance traveled by a craft while the relative bearing changes from 22.5° to 45°.

43

Ocean currents are fairly stable regular and well-defined and extend over long distances.

True

44

Leeward is

Toward the Lee or in that general direction toward which the wind is blowing.
(the opposite of windward)

45

What is Slack?

The period of high or low water when there is no change in the height of water

46

Set is described as

To or towards

47

What is flood?

The movement of water towards shore or upstream.

48

The rise and fall of the tide is not uniform.

True

49

The Gulf Stream is characterized as

A Swift high saline current of Bluewater who’s upper Stratham is composed of warm water

50

The single resultant directions from a point of departure to a point of arrival at any given time is the

Course made good

51

What direction does current flow?

Towards the direction it is named

52

Tide is___Movementof water and is said to___.

Vertical; rise or fall

53

Describe the double the angle on the bow rule

The angular distance of the object on the bow is doubled, the distance run between bearings equals the object distance at the second bearing.

54

How is set and drift measured?

From a dead reckoning to a fix

55

Drift is

The speed of the current/knots per hour

56

What is EBB?

The movement of water away from shore or downstream.

57

What are characteristics of spring tide?

Tide of increased range or speed, occur semi monthly, results of moon being new or full