In this discussion, VMS relates specifically to fisheries management systems. VMS describes the specific application of monitoring commercial fishing boats. It is not to be confused with VTS which is describes the specific application of monitoring marine traffic primarily for safety and efficiency in ports and busy waterways. It is also not to be confused with specific communication technologies such as AIS, Iridium, Inmarsat, Argos, GPRS which relate to the communication method on which data is transmitted. Different VMS systems will use different communication technologies depending on the functionality requirements imposed by a national or regional VMS initiative.