Презентация на тему Navigational light characteristics

light.

shorter than dark.

amounts of light and dark.

In this case, groups of three.

shorter than light.

flashing.

50 or 60 per minute.
Where are you likely to

see this type of light?
Cardinal Marks - North/South etc

What is this Chart abbreviation for?
V.Qk.Fl.
Very Quick flashing 100 or 120 per minute.
Where are you likely to see this type of light?
Cardinal Marks

In this case, groups of two.

of time taken (in seconds) to complete one full

cycle. E.g. 10s is a period of ten seconds.
The range (in nautical miles) at which a light can be seen in good visibility is denoted by a capital M. E.g. 25M indicates a range of twenty five nautical miles.
The height (in metres) of a light above 'mean high water springs' (MHWS) is denoted by a small m. E.g. 15m indicates a height of fifteen metres.
The colour of a light is usually denoted by the first letter. e.g. R is red, G is green.

light flashing in groups of three
every twenty seconds

at a height of fifteen metres above MHWS
that could be seen at a distance of twenty five nautical miles in good visibility.

all information available on charts.
Practise determining what a light

will look like before you see it.
Work out how early you can expect to see a light – how?
Height of light – range + horizon of vessel