{"data":{"id":"us/47-cfr-80.385","jurisdiction":"us","citation":"47 CFR 80.385","heading":"Frequencies for automated systems.","body":"This section describes the carrier frequencies for the Automated Maritime Telecommunications System (AMTS) and for other automated multi-station systems.\n(a) Automated Maritime Telecommunications System (AMTS). (1) The Automated Maritime Communications System (AMTS) is an automated maritime telecommunications system.\n(2) The following carrier frequencies are available for assignment to public coast stations for public correspondence communications with ship stations and units on land. AMTS operations must not cause harmful interference to the U.S. Navy SPASUR system which operates in the band 216.880-217.080 MHz.\nChannel No. Carrier frequency (MHz)\nShip transmit 1 3 Coast transmit 2 Group\n101 216.0125 D\n102 216.0375\n103 216.0625\n104 216.0875\n105 216.1125\n106 216.1375\n107 216.1625\n108 216.1875\n109 216.2125\n110 216.2375\n111 216.2625\n112 216.2875\n113 216.3125\n114 216.3375\n115 216.3625\n116 216.3875\n117 216.4125\n118 216.4375\n119 216.4625\n120 216.4875\n121 216.5125 C\n122 216.5375\n123 216.5625\n124 216.5875\n125 216.6125\n126 216.6375\n127 216.6625\n128 216.6875\n129 216.7125\n130 216.7375\n131 216.7625\n132 216.7875\n133 216.8125\n134 216.8375\n135 216.8625\n136 216.8875\n137 216.9125\n138 216.9375\n139 216.9625\n140 216.9875\n141 219.0125 217.0125 B\n142 219.0375 217.0375\n143 219.0625 217.0625\n144 219.0875 217.0875\n145 219.1125 217.1125\n146 219.1375 217.1375\n147 219.1625 217.1625\n148 219.1875 217.1875\n149 219.2125 217.2125\n150 219.2375 217.2375\n151 219.2625 217.2625\n152 219.2875 217.2875\n153 219.3125 217.3125\n154 219.3375 217.3375\n155 219.3625 217.3625\n156 219.3875 217.3875\n157 219.4125 217.4125\n158 219.4375 217.4375\n159 219.4625 217.4625\n160 219.4875 217.4875\n161 219.5125 217.5125 A\n162 219.5375 217.5375\n163 219.5625 217.5625\n164 219.5875 217.5875\n165 219.6125 217.6125\n166 219.6375 217.6375\n167 219.6625 217.6625\n168 219.6875 217.6875\n169 219.7125 217.7125\n170 219.7375 217.7375\n171 219.7625 217.7625\n172 219.7875 217.7875\n173 219.8125 217.8125\n174 219.8375 217.8375\n175 219.8625 217.8625\n176 219.8875 217.8875\n177 219.9125 217.9125\n178 219.9375 217.9375\n179 219.9625 217.9625\n180 219.9875 217.9875\n1 Ship transmit frequencies in Groups C and D are not authorized for AMTS use.\n2 Coast station operation on frequencies in Groups C and D are not currently assignable and are shared on a secondary basis with the Low Power Radio Service in part 95 of this chapter. Frequencies in the band 216.750-217.000 MHz band are available for low power point-to-point network control communications by AMTS coast stations under the Low Power Radio Service (LPRS). LPRS operations are subject to the conditions that no harmful interference is caused to the United States Navy's SPASUR radar system (216.88-217.08 MHz) or to TV reception within the Grade B contour of any TV channel 13 station or within the 68 dBu predicted contour of any low power TV or TV translator station operating on channel 13.\n3 Ship transmit frequencies in Groups A and B are permitted to provide mobile-to-mobile communications where the written consent of all affected licensees is obtained.\n(3) As listed in the table in this paragraph (a)(3), AMTS Areas (AMTSAs) are based on, and composed of one or more of, the U.S Department of Commerce's 172 Economic Areas (EAs). See 60 FR 13114 (March 10, 1995). In addition, the Commission shall treat Puerto Rico, the United States Virgin Islands, and the Gulf of Mexico as EA-like areas. The Gulf of Mexico EA extends from 12 nautical miles off the United States Gulf coast outward into the Gulf. See § 27.6(a)(2) of this chapter and 62 FR 9636. Maps of the EAs and AMTSAs are available for public inspection through the Federal Communications Commission's Reference Information Center. These maps and data are also available on the FCC website at www.fcc.gov/oet/info/maps/areas/. These maps and data are also available on the FCC Web site at www.fcc.gov/oet/info/maps/areas/. The Group A and B frequency pairs listed in the table in paragraph (a)(2) of this section are available for assignment to a single licensee in each of the AMTSAs listed in the table in this paragraph (a)(3). In addition to the listed EAs listed in the table in this paragraph (a)(3), each AMTSA also includes the adjacent waters under the jurisdiction of the United States.\nAMTS areas (AMTSAs)\nAMTSAs EAs\n1 (Northern Atlantic) 1-5, 10 9, 11-23, 25, 42, 46\n2 (Mid-Atlantic) 24, 26-34, 37, 38, 40, 41, 174\n3 (Southern Atlantic) 35, 36, 39, 43-45, 47-53, 67-107, 113, 116-120, 122-125, 127, 130-134, 176 6-8, 54-66, 108, 109\n4 (Mississippi River) 160-165 147, 166-170\n5 (Great Lakes) 172\n6 (Southern Pacific) 171 110-112, 114-115, 121, 126, 128, 129, 135-146, 148-159\n7 (Northern Pacific)\n8 (Hawaii)\n9 (Alaska)\n10 (Mountain)\n(4) Channels in the 219-220 MHz band are also used on a secondary, non-interference basis by amateur stations participating in digital message forwarding systems. Amateur stations may not cause harmful interference to AMTS operations and must accept any harmful interference from AMTS operation. Amateur stations within 80 km (50 miles) of an AMTS coast station must obtain written approval from the AMTS licensee prior to operating in the 219-220 MHz band. Amateur stations within 640 km (398 miles) of an AMTS coast station must notify the AMTS licensee in writing at least 30 days prior to initiation of operations in the 219-220 MHz band. All amateur stations must notify the American Radio Relay League in writing at least 30 days prior to initiation of operations in the 219-220 MHz band (ARRL, 225 Main St., Newington, CT 06111-1494).\n(b) Subject to the requirements of § 1.924 of this chapter, §§ 80.215(h), and 80.475(a), each AMTS geographic area licensee may place stations anywhere within its region without obtaining prior Commission approval provided:\n(1) The AMTS geographic area licensee must locate its stations at least 120 kilometers from the stations of co-channel site-based AMTS licensees. Shorter separations between such stations will be considered by the Commission on a case-by-case basis upon submission of a technical analysis indicating that at least 18 dB protection will be provided to a site-based licensee's predicted 38 dBu signal level contour. The site-based licensee's predicted 38 dBu signal level contour shall be calculated using the F(50, 50) field strength chart for Channels 7-13 in § 73.699 (Fig. 10) of this chapter, with a 9 dB correction for antenna height differential. The 18 dB protection to the site-based licensee's predicted 38 dBu signal level contour shall be calculated using the F(50, 10) field strength chart for Channels 7-13 in § 73.699 (Fig. 10a) of this chapter, with a 9 dB correction factor for antenna height differential.\n(2) The locations and/or technical parameters of the transmitters are such that individual coordination of the channel assignment(s) with a foreign administration, under applicable international agreements and rules in this part, is not required.\n(3) For any construction or alteration that would exceed the requirements of § 17.7 of this chapter, licensees must notify the appropriate Regional Office of the Federal Aviation Administration (FAA Form 7460-1) and file a request for antenna height clearance and obstruction marking and lighting specifications (FCC Form 854) with the FCC, Attn: Information Processing Branch, 1270 Fairfield Rd., Gettysburg, PA 17325-7245.\n(4) [Reserved]\n(c) Any recovered frequency blocks will revert automatically to the holder of the geographic area license within which such frequencies are included. Any frequency blocks recovered where there is no geographic area licensee will be retained by the Commission for future licensing.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 80—STATIONS IN THE MARITIME SERVICES","Subpart H—Frequencies"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-47.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:28Z","sha256":"75706324b5c5fb6a279073be48ba7849e48cf3493b91db752035370f57cc7df7","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-80.383","next":"us/47-cfr-80.387"},"notice":"GroundRules: Original legal text. Not legal advice."}