Goto Section: 80.177 | 80.201 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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;
(v) Listing, in danger of capsizing;
(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
(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
[ 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.
Subpart E—General Technical Standards
Goto Section: 80.177 | 80.201
Goto Year: 2020 |
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