Explanation: The Global Maritime Distress and Safety System (GMDSS) is designed to ensure safety at sea by providing essential communication capabilities. Option D correctly identifies three core required GMDSS functions: * **Bridge-to-Bridge communications:** This is critical for collision avoidance and safe navigation, primarily using VHF Channel 13 or 16. * **General communications:** GMDSS equipment must enable routine ship business and public correspondence, such as transmitting and receiving calls or data. * **SAR (Search and Rescue) communications:** This encompasses alerting, coordinating rescue efforts, and on-scene communications during an emergency. The other options contain elements that are either not universally required GMDSS functions or are too specific: * **A and B:** While reception of Maritime Safety Information (MSI), which includes weather, is a GMDSS requirement, "weather map facsimile broadcasts" are a specific delivery method not universally mandated. "Receiving company email" is a subset of general communications, but not a distinct required function. * **C:** "Reception of VHF weather channels" (like NOAA Weather Radio) is a regional service and not a primary GMDSS requirement for MSI, which is typically received via Navtex, EGC (Inmarsat-C), or HF telex.