§ 80.179   Unattended operation.

   The following unattended transmitter operations are authorized:

   (a) EPIRB operations when emergency conditions preclude attendance of the
   EPIRB transmitter by a person.

   (b)  Automatic use of a transmitter during narrow-band direct-printing
   (NB-DP) operations in accordance with § 80.219.

   (c) Automatic use of a transmitter during selective calling operations in
   accordance with § 80.225.

   (d) Automatic use of a transmitter when operating as part of the Automated
   Maritime Telecommunications System (AMTS), an automated multi-station system
   for which provisions are contained in this part, or an automated public
   coast station.

   (e) Automatic use of a VHF transmitter to send brief digital communications
   relating to the condition or safety of vessels while moored when all of the
   following conditions are met:

   (1) The equipment must be using DSC in accordance with ITU-R M.493-13 and
   ITU-R M.541-9 (both incorporated by reference, see § 80.7), as modified by
   this section.

   (2) Sensors must automatically activate the transmitter only under one or
   more of the following conditions:

   (i) Fire, explosion;

   (ii) Flooding;

   (iii) Collision;

   (iv) Grounding;

   (v) Listing, in danger of capsizing;

   (vi) Sinking;

   (vii) Disabled and adrift; and

   (viii) Undesignated condition related to ship safety.

   (3) The “ROUTINE” DSC category must be used.

   (4) Communications must be selectively addressed to an individual station.

   (5) Transmitter output power must not exceed one watt.

   (6) The call must employ a fixed format and must be in conformity with
   Recommendation 493 as follows:

   Format specifier: Individual call—symbol 120 sent twice.

   Address: 9 digit maritime mobile service identity of called station.

   Category: Routine—symbol 100.

   Self-identification: 9 digit ship station identity.

   Message 1: Telecommand symbol 126 sent twice.

   Message 2: Telecommand symbol 126 sent 6 times.

   End of sequence: Symbol 127.

   Error-check character: Check sum.

   (7) Such transmissions are permitted only on channel 70 and the transmitter
   must be inhibited automatically whenever there is another call in progress
   on Channel 70.

   (8) The call sequence for any one alarm must not be repeated until after an
   interval of at least five seconds. Further repetition is permitted only
   after intervals of at least fifteen minutes each. Repetitions following
   fifteen-minute waiting intervals must not exceed three.

   [ 54 FR 10008 , Mar. 9, 1989, as amended at  62 FR 40305 , July 28, 1997;  68 FR 46962 , Aug. 7, 2003;  73 FR 4481 , Jan. 25, 2008;  76 FR 67611 , Nov. 2, 2011]

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Subpart E—General Technical Standards

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