Explanation: Ships compulsorily equipped with a radiotelegraph installation (or GMDSS equipment) are subject to international maritime regulations, primarily the SOLAS (Safety of Life at Sea) Convention. These regulations mandate a reliable intercommunication system between the **radio room (or the GMDSS operating position)** and the **navigation bridge**. This connection is crucial for several reasons: * **Immediate Distress Response:** The bridge controls the ship's navigation and overall command, while the radio room handles distress and safety communications. Direct communication ensures rapid coordination during emergencies. * **Safety of Navigation:** Communication about navigational hazards, weather warnings, or other safety-related information can be swiftly exchanged. * **Operational Efficiency:** It allows the Officer of the Watch on the bridge to instruct the radio operator quickly, or for the radio operator to relay urgent messages directly to command. Therefore, option C is correct as it identifies this critical, mandated link. Other options, while possibly useful for general ship operations, are not the specific, compulsorily required intercommunication system mandated in connection with the radiotelegraph installation for distress and safety purposes.