Charts and Tides

Question 1

What does SOLAS Stand for

Answer 1

Safety Of Life At Sea

Question 2

BLANK

Answer 2

blank

Question 3

What two factors determine the Maximum Ranges of Lights?

Answer 3

The light must be powerful enough to be seen ( Luminous Range)

The light must be above the horizon (Geographical Range)

Question 4

What is Nominal Range and where can it be found

Answer 4

The luminous range when meteorological visibility is 10 miles.

It can be found in the characteristics of the light given on the chart or column 6 of the admiralty list of lights and fog signals

Question 5

What is luminous range

Answer 5

The maximum distance at which a light can be seen at a given time
Determined by the intensity of the light and the meteorological visibility at the time
Doesn’t account for: elevation, observers height of eye or earth curvature
Calculated using a he luminous range diagram

Question 6

What two different levels is charted elevation measured from

Answer 6

Floating lights - sea level to the focal plane of the light
Lighthouses - MHWS to the focal plane of the light

Question 7

What is Geographical Range

Answer 7

The maximum distance, at which light from a lighthouse can theoretically reach an observer, limited only by earth’s curvature, refraction of atmosphere, elevation of light and height of eye of the observer

Question 8

A Fix is Indicated with …

Answer 8

A small circle, and, if possible, a time

Question 9

Positions of Lighthouses are taken from…

Answer 9

The centre of the circle within the star shape

Question 10

How is an Observed Bearing Shown on a Chart

Answer 10

A line with a single open arrow head away from the object

Question 11

When “Suffering the Effects”, is the leeway taken into account for the water track

Answer 11

Yes

Question 12

What is Water Track

Answer 12

The ships heading + or - the leeway

Question 13

What is the Ground Track

Answer 13

Course in straight line

Question 14

What does this symbol mean

Answer 14

Depth unknown, but is at least depth shown

Question 15

What Symbol is this

Answer 15

Wreck at least depth shown, swept by wire drag

Question 16

What Symbol is this

Answer 16

Wreck, last depth known obtained by sounding only

Question 17

What Symbol is this

Answer 17

Visible Wreck

Question 18

What Symbol is this

Answer 18

Visible Wreck

Question 19

What Symbol is this

Answer 19

Wreck, least depth unknown but usually at least 20m

Question 20

What Symbol is this

Answer 20

Wreck, least depth unknown but usually at least 20m

Question 21

How do you plot a GPS fix on a chart

Answer 21

Just plot the lat and long given on the GPS (most basic plotting)

Question 22

What Plotting Technique is it when you use Things you can See to take a Bearing

Answer 22

Visual Bearing Lines

Question 23

What needs to be done to a compass bearing before it can be plotted on a chart

Answer 23

Convert it to a true bearing

Question 24

How do you convert a Compass bearing to a True bearing

Answer 24

(TVMDC)<
Compass bearing
(+) Deviation Correction
(=) Magnetic Bearing
(Apply) Variation
(=) True Bearing

Question 25

Where will you find the Deviation for True Bearing calculations

Answer 25

Deviation card (probably within the tide tables book)

Question 26

How do you know if you should add or subtract Deviation

Answer 26

Look at current direction on compass and look at whether Deviation is east or west. EG: 90°C and Dev = 4°E, add 4+90

Question 27

When adding or subtracting variation should you leave it as degree’s and minutes

Answer 27

No, convert it to decimals then add or subtract

Question 28

When plotting a line from a visual fix, what should be added to the line

Answer 28

A single arrow head to show that the line could continue forever as we don’t know where on that line we are

Question 29

What are Range lines marked with

Answer 29

An arrow at each end to indicate that the line could extend either direction

Question 30

What should you add to fixing lines if given

Answer 30

The time which it was taken

Question 31

When you have found your fix (where lines intersect) how should you mark it?

Answer 31

With a circle around the intersection (cross)

Question 32

What is a transferred line marked by

Answer 32

Two arrows on one end