AP17 – 111 – Calling on the carrier frequencies 12 290 kHz and 16 420 kHz shall be permitted only to and from rescue coordination centres (see No. 30.6.1), subject to the safeguards of Resolution 352 (WRC-03) (see Nos. 52.221A and 52.222A). The remaining frequencies in Sub-Sections A, B, C-1 and C-2 are working frequencies. (WRC-03) 5A For the use of the carrier frequencies: 4 125 kHz (Channel No. 421); 6 215 kHz (Channel No. 606); 8 291 kHz (Channel No. 833); 12 290 kHz (Channel No. 1221); 16 420 kHz (Channel No. 1621); in Sub-Section A, by coast and ship stations for distress and safety purposes, see Article 31. (WRC-07) 6 a) Maritime radiotelephone stations using single-sideband emissions in the frequency bands between 4 000 kHz and 27 500 kHz exclusively allocated to the maritime mobile service shall operate only on the carrier frequencies shown in the Sub-Sections A and B and, in the case of analogue radiotelephony, shall be in conformity with the technical characteristics specified in Recommendation ITU-R M.1173-1. (WRC-15) b) Ship stations, when using frequencies for single-sideband emissions in the frequency band 4 000-4 063 kHz, and ship and coast stations, when using frequencies for single-sideband emissions in the frequency band 8 100-8 195 kHz, should operate on the carrier frequencies indicated in Sub-Sections C-1 and C-2 respectively. In the case of analogue radiotelephony technical characteristics of the equipment shall be those specified in Recommendation ITU-R M.1173-1. (WRC-15) c) Stations, when employing the single-sideband mode for analogue radiotelephony, shall use only class J3E emissions. For digital communications, class J2D emissions shall be used. (WRC-03) 7 The channelling plan established in Sub-Section C-2 does not prejudice the rights of administrations to establish, and to notify assignments to stations in the maritime mobile service other than those using radiotelephony in the frequency band 8 100-8 195 kHz, in conformity with the relevant provisions of these Regulations. 8 (SUP - WRC-03)