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Power Squadron > Plotting > Flashcards

Plotting Flashcards

0
Q

What causes the area of uncertainty?

A

Currents, wind, human error

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1
Q

What is the area of uncertainty?

A

Margin of error

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2
Q

What is speed on the water expressed in?

A

Knots (nautical miles per hour.) 1.15 miles

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3
Q

Why not just use a GPS?

A

Because batteries die.

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4
Q

How do you measure speed?

A

With RPMs or speed indicators.

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5
Q

What is a course?

A

The intended direction of movement through the water.

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6
Q

What different types of courses are there?

A

True, magnetic, compass

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7
Q

A course can be 000* to -

A

359*

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8
Q

What is a course line?

A

The line on a chart which the navigator plots.

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9
Q

What can the course line be labelled in?

A

True or magnetic

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10
Q

How is a course line written?

A

Alway drawn from a known fix. Above is the true and magnetic degree, written C080/M060. Under the course line is the speed. Written S 6.0.

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11
Q

What is a heading?

A

The direction in which a vessel’s bow is pointing.

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12
Q

What is the short form for heading?

A

hdg

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13
Q

What can a heading be written in?

A

000* - 359*

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14
Q

What must you remember regarding your hdg?

A

It is almost always different from your course because of wind and currents.

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15
Q

What is dead reckoning based on?

A

The True course and the calculated distance travelled through water.

16
Q

What is DR?

A

Dead reckoning. They are positions along the course line starting at a fix and showing the position of the boat based on speed and elapsed time

17
Q

DR positions are plotted at

A

Regular intervals (every hour), at any change in course or speed, at a bouy.

18
Q

What is CMG?

A

Course Made Good. A straight line plot of a vessels travel between adjacent fixes. Obtained by drawing a line directly from one fix to the next.

19
Q

LOP?

A

Line Of Position

Power Squadron (5 decks)

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