This International Standard specifies the minimum performance requirements, technical characteristics, methods of testing and test results required by IMO Resolution MSC,64(67) Annex 4. This standard takes account of IMO Resolution A.694 and is associated with IEC 945. When a requirement in this standard is different from IEC 945, the requirement in this standard shall take precedence. Equipment intended for use on high speed craft (HSC) shall additionally satisfy the requirements of the HSC scenarios as defined in IEC 60936-2 annex D.