These cables are used for the detection or signature identification of vessels. A system will consist of an allocated area containing sensors linked by cables. Cables can be fixed or portable, and transmit the required power and data to onshore control centres. System deployment is sometimes located in busy shipping areas where damage due to anchorage or fishing activity is possible. Therefore design for a robust cable is paramount, and generally a steel wire armoured package is offered. Termination of these types of cable is also critical as the life expectation for these systems is considerable.