Uses arangement of directional sound patterns which send instant signals to the brain as to where the alarm is sited at selected points along the exit way. Different sounds may be incorporated at strategic points in order to transmit instructions such as whether to take the ascending or descending stairway. Voice message from 2 to 30 seconds output via a speaker or ear device. Marco Navigation System Picture For the Marco system to work a facility must be equipped with Marco transmitters and users must carry Marco receivers. Transmitter is fixed in position and continually emits an infrared signal relevant to its location.
Receivers have a listening button and a volume control.