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156.8 MHz channel 25 watts aircraft Amplitude Modulation atmospheric noise Average Radiotelephone band is intended Calling Frequency Citizens Band Coast Guard District Coast Guard Station Coast Stations Marine coastal COMMERCIAL Intership compatible DSB continuous guard Distress Call distress channel distress communications distress frequency coverage Distress Frequency Guard DISTRESS INFORMATION SHEET distress or difficulty District Federal Building double sideband erating Guard District Federal Gulf of Mexico Interference Factor interference from distant Intership & ship-to-shore Intership Safety frequency kHz all areas kHz Gulf maintain a continuous man-made noise Marine Information broadcasts Marine radio communications MARITIME MOBILE BAND MAYDAY MHz band MHz channel 16 NON-COMMERCIAL Intership number of channels Power of Average Public Coast Stations quencies Radio checks recreational boatman ship to ship ship to shore Stations Marine Operator surface craft throttle or changing tion Type of Transmission U.S. COAST VESSEL IN DIFFICULTY vessel's call VHF-FM equipment VHF-FM MARITIME MOBILE