alertness

anchor

bridge

building

button

buzzer

captain

cargo

chain

computer

control

deck

electric

electricity

energy

engineer

equipment

fire

fist

freight

help

hitting

hold

inside

instrument

knob

load

man

marine

mooring

navigation

off

oil

panel

panic

people

power

radar

red

repair

river

rope

security

services

switch

system

technology

transporting

worker