Channel 18 is the international distress calling frequency.

Bluetooth is a proposed Radio Frequency specification for ()

Our ________ reaction when someone causes us pain is to strike back

Let's assume that person A is calling the meeting. The most cooperative position is （ ） to him/her (B) because there are no barriers between them.

In case of emergency, the navigational officer has to make some quick decisions because the safety of the entire ship and her crew depends on him.

If the radio is in the simplex mode, speaking and listening can be done simultaneously.

Wind wave is the wave motion caused by distant winds and has flat crests.

“Strong gale” is used to describe the wind force.