RYA Day Skipper Navigation and Chartwork

Question 1

On an Admiralty chart, what do the letters 'M' and 'S' indicate when describing the seabed?

Accepted Answer

Mud and Sand

Answer

Metal and Steel

Answer

Magnetic and Standard

Answer

Marks and Signals

Question 2

What is the difference between 'variation' and 'deviation' in compass navigation?

Accepted Answer

Variation is the difference between true and magnetic north; deviation is the error caused by the vessel's own magnetic field

Answer

They are the same thing

Answer

Variation only applies to GPS

Answer

Deviation is the difference between true and magnetic north

Question 3

When plotting a position on a chart using latitude and longitude, which coordinate is read first?

Accepted Answer

Latitude

Answer

Longitude

Answer

It doesn't matter

Answer

Bearing

Question 4

What is a 'cocked hat' in chartwork?

Accepted Answer

The triangle formed when three position lines do not intersect at a single point

Answer

A type of navigational buoy

Answer

A weather pattern

Answer

A type of anchor

Question 5

How is distance typically measured on a nautical chart?

Accepted Answer

Using the latitude scale at the side of the chart, where one minute of latitude equals one nautical mile

Answer

Using the longitude scale

Answer

Using a separate ruler

Answer

Using the compass rose

Question 6

What does a chart datum of 'LAT' mean?

Accepted Answer

Lowest Astronomical Tide — the lowest level the tide is predicted to reach under normal conditions

Answer

Latitude reference point

Answer

Local Authority Territory

Answer

Latest Arrival Time