Section 130.440 - Communications system(a) Each OSV must have a communications system to immediately summon a crew member to the machinery space wherever one of the alarms required by § 130.460 of this subpart is activated.(b) The communications system must be either-(1) An alarm that-(i) Is dedicated for this purpose;(ii) Sounds in the crew accommodations and the normally manned spaces; and(iii) Is operable from the pilothouse; or(2) A telephone operated from the pilothouse that reaches the master's stateroom, engineer's stateroom, engine room, and crew accommodations that either- (i) Is a sound-powered telephone; or(ii) Gets its power from the emergency switchboard or from an independent battery continuously charged by its own charger.