Explanation: EPIRB (Emergency Position Indicating Radio Beacon) tests are indeed normally logged monthly. This requirement stems from international maritime safety regulations, particularly those related to the Global Maritime Distress and Safety System (GMDSS), which are enforced by entities like the FCC for U.S. vessels. Vessels equipped with EPIRBs must conduct a self-test each month to verify the beacon's operational status and battery condition, logging the date and results in the ship's logbook. This ensures the device is ready to transmit a distress signal in an emergency. Conversely, there is no widespread regulatory requirement for logging generic battery tests daily (A) or general radiotelephone tests weekly (C) for most radio operations, including amateur radio. While specific equipment or operational contexts might have unique test schedules, monthly EPIRB testing and logging is a well-established and broad regulation for maritime safety.