On a nautical chart，the inner ring of a compass rose indicates（）.

Which would influence a magnetic compass（）.

Steam smoke will occur when（）.

Why is a warning sign displayed at the gangway or access point of a barge during cargo transfer（）.

Generally，（）are used as the track charts on the high sea，（）are used for harbors，inland waters and coastal areas．

Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.

In revised editions of Admiralty charts the（）are corrected first．

Which is a weekly publication advising mariners of important matters affecting navigational safety（）.

The fog most commonly encountered at sea is called（）.

Navigational warnings are published according to（）.