CHARTS

Question 1

How is Piloting used for navigation?

Answer 1

use of visible landmarks and AtoN as well as by soundings.

Question 2

How is dead reckoning used for navigation?

Answer 2

by true or magnetic course steering and using speed to determine distance traveled from a known point in a known period.

Question 3

How is electrical navigation used?

Answer 3

any radio bearings, GPS, and other electronic

systems.

Question 4

To represent the features of the earth’s spherical surface on the flat surface of a chart, a process termed “projection” is used. Two basic types of projection used in making piloting charts are:

Answer 4

• Mercator- Mercator charts are the primary charts used aboard boats. A Mercator projection is made by
transferring the surface of the globe (representing the earth) onto a cylinder.
• Gnomonic- Gnomonic projections aid in long distance navigation by allowing navigators to use great circle courses.
Gnomonic charts are not normally used for boat navigation.

Question 5

Where is true direction on a compass rose?

Answer 5

Printed on the outside

Question 6

where is magnetic direction pointed on a compass rose?

Answer 6

On the inside

Question 7

what is variation?

Answer 7

its the difference between true and magnetic north for the particular area covered by the chart. Also printed in the middle of the C-Rose.

Question 8

what color is shallow water on a chart?

Answer 8

Darker blue

Question 9

what color is deeper water on a chart?

Answer 9

light blue or white

Question 10

Contour lines are considered what?

Answer 10

Fathom curves, connect points of roughly equal depth and provide a profile of the bottom.

Question 11

Latitude on a chart is ?

Answer 11

North and South, and is used to measure distance.

Question 12

Longitude on a chart is?

Answer 12

East and West

Question 13

What are the Notes on the Chart indicating?

Answer 13

found on various places meanings are:

abbreviations special notes of caution regarding danger tidal info reference to anchorage

Question 14

How are Corrections entered on a chart?

Answer 14

Corrections occurring after the date of issue are published in the Notice to Mariners and
must be entered by hand on the chart of your local area upon receipt of the notice.

Question 15

What is the scale of a chart reading 1:5,000,000 mean?

Answer 15

means that 1 inch is equal to 5,000,000 on the earths surface.
Large scale = small surface
Small scale = large surface

Question 16

what is the chart scale for sailing?

Answer 16

1:600,000 and smaller and Purple in color

Question 17

what is the Coastal chart scale?

Answer 17

1:50,000 to 1:150,000 inshore navigation

Question 18

what is Harbor charts scale?

Answer 18

1;50,000 and larger

Question 19

what are small craft charts?

Answer 19

1;40,000 and larger

Question 20

What are the two types of Electronic charts?

Answer 20

Raster and Vector charts and the CG uses Raster

- and we use vector charts

Question 21

when there is only two LOP’s for a fix, what must be the angular difference?

Answer 21

no less than 60 and no more than 120 degree’s, so they should intersect at rt angles or near rt angles.

Question 22

an ideal fix has three or more ?

Answer 22

LOP’s

Question 23

What are 1 digit charts?

Answer 23

One digit charts or in reality not nautical charts they consist of chart one symbols in abbreviations

Question 24

What are 2 digit charts?

Answer 24

Two digit church or small scale charts depicting ocean basins in time zones

Question 25

What are 4 digit charts?

Answer 25

Four digit charge or non-navigational planning charts and sheets they include a large scale planning charts and maneuvering boards

Question 26

5 digit charts

Answer 26

Five digit charge show coastal areas in a large enough skilled to show the entire coast line or even a river entrance

Question 27

What is formula for Fahrenheit

Answer 27

(F-32)x 5/9

Question 28

What is the formula for Celsius

Answer 28

(Cx9/5) + 32