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Flashcards in 9. Navigation Deck (20)
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0

The best binocular for use on a recreational vessel is

7 X 50

1

For overall planning on a long cruise, navigators should select a chart with

a SMALL scale that shows a LARGE area

2

1 minute of latitude equals

1 nautical mile

3

Charts are being revised to use only the following datum for soundings

mean LOWER LOW water

4

Which of the following measures distances north or south of the equator?

latitude

5

Which scale of a chart should never be used for measuring distance?

LONGitude

6

The direction of a course is the angle it makes with a

meridian

7

You can find the amount of variation in your boating area by

looking at a compass ROSE on the chart of the area

8

If you measure the direction of a course line from a chart meridian, you have a

true direction

9

Variation is the difference between

True north and MAGNETIC north

10

Deviation is a compass error caused by

magnetic influences aboard your vessel

11

The technical term for the benchmark from which a marine chart's vertical and horizontal measurements are made is

datum

12

Direction can be determined on a Mercator chart by using the

compass rose

13

A speed table is used to

determine speed from a tachometer reading

14

The vertical datum of a chart

helps you know how much clearance there is under a bridge

15

To correct a compass reading

add easterly variations

16

Mercator projections are made by projecting the earth's surface onto a

cylinder

17

On a chart, shallow water is

light blue

18

If you travel at a speed of 12 KNOTS for 10 MINUTES you will have gone how far?

2.0 Nautical miles

1 knot is 1 nautical mile per hour. 12 knots is a mile every 5 minutes

19

In an area with a variation of 12 degrees E, your heading is 130 degrees by your compass. The DEVIATION for this heading is 3 degrees W. What is your true heading?

139 degrees. 130 degrees, plus the VARIATION of 12 degrees EAST, MINUS the 3 degree DEVIATION WEST