intercom; intercommunication system
Refers to an internal communication device used on ships (and sometimes other vessels or large vehicles). It is especially used in ships.
See also: インターコム
Please contact the engine room via the ship's intercom.
この船には最新の船内通話装置が備え付けられている。
This ship is equipped with the latest intercommunication system.
A more general loanword for intercom, used in buildings, offices, and homes, while 船内通話装置 is specifically for onboard ship communication.
Compound of 船内 (onboard a ship), 通話 (communication, telephone call), and 装置 (device, equipment).