An aneroid barometer on a boat should always be（）.

An “atoll cloud” forming over an island due to heating of the land during the daytime would be which type? （）

Aids to navigation marking the intracoastal waterway can be identified by（）.

An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.

An icebreaker displaying a flag hoist which consists of the code letters “WO” (Whiskey Oscar) is indicating that（）.

Antiseptics are used principally to（）.

All personnel on board a vessel should be familiar with the rescue boat’s（）.

All OSV personnel should be familiar with survival craft（）.

An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.

AMVER is a system which provides（）.