The present document specifies technical characteristics and methods of measurements for VHF radio transmitters and receivers operating on board ships in frequency bands allocated to the maritime mobile service, used on inland waterways as defined by Regional Agreements or responsible Administrations. The present document applies to VHF transmitters and receivers fitted with a 50 O external antenna socket or connector for use on board ships on inland waterways and operating in the bands between 156 MHz and 174 MHz allocated to the maritime mobile service by the ITU Radio Regulations [1], Appendix 18. For countries where the Automatic Transmitter Identification System (ATIS) is mandatory, the requirements of annex B apply as well.