The short-long dashed magenta line around Gardiners Island marks（）.

The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the（）.

Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.

The only cylindrical chart projection widely used for navigation is the （）.

The soundings on the chart are based on the depth of water available at （）.

When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）

Which aid is NOT marked on a chart with a magenta circle? （）

Every chart is liable to be incomplete（）.

When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.

Which chart symbol indicates the bottom is clay（）.