ISO 22472:2006 provides guidance for the planning, installation and operational testing of voyage data recorder (VDR) and simplified voyage data recorder (S-VDR) installations according to the electric/electronic and acoustic specifications of IMO A.861 (20), IMO MSC.163 (78) and IEC 61996 (including IEC 61996-2, Simplified voyage data recorder). These standards mainly deal with interfaces between VDR/S-VDR and external sensors, which is the main subject for technical agreements between user, shipyard, VDR/S-VDR supplier and/or sensor manufacturers when installations are planned. In addition, matters of performance test and playback are also described. Furthermore, details for checking of items related to the interfaces and the installation are introduced. ISO 22472:2006 is not intended for the standardization of performance factors and functional requirements related to VDR and/or S-VDR.