Section 108.405 - Fire detection system(a) Each fire detection system and each smoke detection system on a unit must- (1) Be approved by the Commandant in accordance with 46 CFR 161.002 ; and(2) Have a visual alarm and an audible alarm in the pilothouse or at a normally manned control station for the system.(b) Each fire detection system must be divided into zones to limit the area covered by any particular alarm signal.(c) Each visual alarm must-(1) Have a chart or diagram next to the alarm that shows the location of the zones in the system and that contains the instructions for operating, and testing the system;(2) When activated show the zone in the system where fire has been detected; and(3) Be in a noticeable location in the pilothouse or control station.CGD 73-251, 43 FR 56808, Dec. 4, 1978, USCG-2012-0196, 81 FR 48266 , July 22, 2016