Systems and networks for monitoring or detecting the location of people; electronic transmitter/receiver devices to be worn by people for use with the aforesaid systems and networks; controllers and routers in this class; computerized management consoles; battery chargers; people monitoring and detecting systems for monitoring the whereabouts of people on boats and industrial, commercial and other land based sites; and transmitters and receivers for the aforesaid systems and networks

Scientific, nautical and lifesaving apparatus and instruments; electronic devices for transmitting, receiving and amplifying electronic signals