Conditions to be observed in the maritime services

§ 1 The energy radiated by receiving apparatus shall be reduced to the lowest practical value and shall not cause harmful interference to other stations.

§ 2 Administrations shall take all practicable steps necessary to ensure that the operation of any electrical or electronic apparatus installed in ship stations does not cause harmful interference to the essential radio services of stations which are operating in accordance with the provisions of these Regulations.

§ 3 1) Changes of frequency in the sending and receiving apparatus of any ship station shall be capable of being made as rapidly as possible.

2) Installations of any ship station shall be capable, once communication is established, of changing from transmission to reception and vice versa in as short a time as possible.

3) The operation of a broadcasting service (see No. 1.38) by a ship station at sea is prohibited (see also No. 23.2).

§ 4 Ship stations and ship earth stations other than survival craft stations shall be provided with the documents enumerated in the appropriate section of Appendix 16.

§ 5 When any ship station transmitter itself cannot be controlled in such a way that its frequency satisfies the tolerance specified in Appendix 2, the ship station shall be provided with a device, having a precision equal to at least one-half of this tolerance, for measuring the frequency of the emission.

Suppressed by the conference; the number is retained. (WRC-07)

§ 12 The characteristics of the digital selective calling equipment should be in accordance with the most recent version of Recommendation ITU-R M.493. (WRC-12)

§ 13 All ship stations equipped with apparatus for digital selective calling to work in the authorized bands between 415 kHz and 535 kHz shall be able to send and receive class F1B or J2B emissions on at least two digital selective calling channels necessary for their service.

§ 14 All ship stations equipped with digital selective calling apparatus to work in the authorized bands between 1 606.5 kHz and 4 000 kHz shall be able to: (WRC-03)

a) send and receive class F1B or J2B emissions on the frequency 2 187.5 kHz;

b) in addition, send and receive class F1B or J2B emissions on other digital selective calling frequencies in this band necessary to carry out their service.

§ 15 All ship stations equipped with digital selective calling apparatus to work in the authorized bands between 4 000 kHz and 27 500 kHz shall be able to:

a) send and receive class F1B or J2B emissions on the frequencies designated for digital selective distress calling in each of the maritime HF bands in which they are operating (see also No. 32.9);

b) send and receive class F1B or J2B emissions on an international calling channel (specified in Recommendation ITU-R M.541-11) in each of the HF maritime mobile bands necessary for their service; (WRC-23)

c) send and receive class F1B or J2B emissions on other digital selective calling channels in each of the HF maritime mobile bands necessary for their service.

§ 16 All ship stations equipped with apparatus for digital selective calling to work in the authorized bands between 156 MHz and 174 MHz shall be able to send and receive class G2B emissions on the frequency 156.525 MHz.

§ 17 1) All ship stations using narrow-band direct-printing telegraphy equipment for general traffic should be able to send and receive on frequencies designated for narrow-band direct-printing telegraphy in the frequency bands in which they are operating. (WRC-23)

2) The characteristics of the narrow-band direct-printing equipment should be in accordance with the most recent versions of Recommendations ITU-R M.476, ITU-R M.625 and ITU-R M.627. (WRC-23)

§ 18 All ship stations equipped with narrow-band direct-printing telegraphy apparatus to work in the authorized bands between 415 kHz and 535 kHz shall be able to:

a) send and receive class F1B or J2B emissions for general traffic on the working frequencies necessary to carry out their service; (WRC-23)

b) receive class F1B emissions on 518 kHz, if complying with the provisions of Chapter VII.

§ 19 All ship stations equipped with narrow-band direct-printing telegraphy apparatus to work in the authorized bands between 1 606.5 kHz and 4 000 kHz shall be able to send and receive class F1B or J2B emissions on working frequencies necessary to carry out their service. (WRC-03)

The characteristics of the automatic connection system should be in accordance with the most recent versions of Recommendations ITU-R M.493 and ITU-R M.541. (WRC-23)

§ 21 All ship stations equipped with radiotelephony apparatus to work in the authorized bands between 1 606.5 kHz and 2 850 kHz shall be able to: (WRC-03)

a) send class J3E emissions on a carrier frequency of 2 182 kHz and receive class J3E emissions on a carrier frequency of 2 182 kHz, except for such apparatus as is referred to in No. 51.56; (WRC-07)

b) send, in addition, J3E emissions on at least two working frequencies;

c) receive, in addition, J3E emissions on all other frequencies necessary for their service.

§ 22 The provisions of Nos. 51.54 and 51.55 do not apply to apparatus provided solely for distress, urgency and safety purposes.

§ 23 All ship stations equipped with radiotelephony to work in the authorized bands between 4 000 kHz and 27 500 kHz and which do not comply with the provisions of Chapter VII should be able to send and receive on the carrier frequencies 4 125 kHz and 6 215 kHz. However, all ship stations which comply with the provisions of Chapter VII shall be able to send and receive on the carrier frequencies designated in Article 31 for distress and safety traffic by radiotelephony for the frequency bands in which they are operating. (WRC-07)

§ 24 All ship stations equipped with radiotelephony to work in the authorized bands between 156 MHz and 174 MHz (see No. 5.226 and Appendix 18) shall be able to send and receive class G3E emissions on:

a) the distress, safety and calling frequency 156.8 MHz;

b) the primary intership frequency 156.3 MHz;

c) the intership navigation safety frequency 156.65 MHz;

d) all the frequencies necessary for their service.

§ 24A All ship stations equipped with NAVDAT apparatus for receiving digital data transmissions in the authorized bands between 415 kHz and 535 kHz shall be capable of receiving class W7D emissions on 500 kHz, if complying with the provisions of Chapter VII. (WRC-23)

§ 24B All ship stations equipped with NAVDAT apparatus for receiving digital data transmissions in the authorized bands between 4 000 kHz and 27 500 kHz shall be capable of receiving class W7D emissions, if complying with the provisions of Chapter VII. (WRC-23)

§ 25 The energy radiated by receiving apparatus shall be reduced to the lowest practical value and shall not cause harmful interference to other stations.

§ 26 Administrations shall take all practicable steps necessary to ensure that the operation of any electrical or electronic apparatus installed in ship earth stations does not cause harmful interference to the essential radio services of stations which are operating in accordance with the provisions of these Regulations.

§ 27 1) Stations on board aircraft may communicate with stations of the maritime mobile or maritime mobile-satellite services. They shall conform to those provisions of these Regulations which relate to these services.

2) For this purpose stations on board aircraft should use the frequencies allocated to the maritime mobile or maritime mobile-satellite services.

3) Stations on board aircraft, when handling public correspondence with stations of the maritime mobile service or of the maritime mobile-satellite service, shall comply with all the provisions applicable to the handling of public correspondence in the maritime mobile or maritime mobile-satellite services (see particularly Articles 53, 54, 55, 57 and 58).

§ 28 In the case of communication between stations on board aircraft and stations of the maritime mobile service, radiotelephone calling may be renewed as specified in the most recent version of Recommendation ITU-R M.1171 and radiotelegraph calling may be renewed after an interval of five minutes, notwithstanding the procedure contained in the most recent version of Recommendation ITU-R M.1170. (WRC-07)

§ 29 1) Having regard to interference which may be caused by aircraft stations at high altitudes, frequencies in the maritime mobile bands above 30 MHz shall not be used by aircraft stations, with the exception of those frequencies between 156 MHz and 174 MHz specified in Appendix 18 which may be used provided that the following conditions are observed:

a) the altitude of aircraft stations shall not exceed 300 m (1 000 feet), except for reconnaissance aircraft participating in ice-breaking operations, where an altitude of 450 m (1 500 feet) is allowed;

b) the mean power of aircraft station transmitters shall not exceed 5 W; however, a power of 1 W or less shall be used to the maximum extent possible;

c) aircraft stations shall use the channels designated for this purpose in Appendix 18;

d) except as provided in No. 51.75, aircraft station transmitters shall comply with the technical characteristics given in Recommendation ITU-R M.489-2;

e) the communications of an aircraft station shall be brief and limited to operations in which stations of the maritime mobile service are primarily involved and where direct communication between the aircraft and the ship or coast station is required.

2) The frequency 156.3 MHz may be used by stations on board aircraft for safety purposes. It may also be used for communication between ship stations and stations on board aircraft engaged in coordinated search and rescue operations (see Appendix 15). (WRC-07)

3) The frequency 156.8 MHz may be used by stations on board aircraft for safety purposes only (see Appendix 15). (WRC-07)