A sensor system comprising: a plurality of sensing elements configured when deployed to be connected together to form a chain; a control element configured when deployed to be connected to the plurality of sensing elements of the chain, and each of the plurality of sensing elements comprises: a housing, first and second interfaces (20, 22), each of the first and the second interfaces being configured to form an electrical and a physical connection to a corresponding interface of another of the plurality of sensing elements or the control element to form the chain; electrical circuitry formed within the housing, the electrical circuitry comprising at least one sensor configured to generate an indication of a relative orientation and tilt of the sensing element, control circuitry configured to control communication of signals via one or both of the first interface and the second interface to at least one of the other sensing elements and/or the control element, wherein the signals communicated via one or both of the first interface and the second interface to the at least one of the other sensing elements and/or the control element include an identification signal for identifying the sensing element and the indication representing the orientation and the tilt of each of the plurality of sensing elements in the chain, and characterised in that the control element is configured to identify the order of the plurality of sensing elements based on the control circuitry of each of the plurality of sensing elements communicating a respective identification signal of the respective sensing element to a first or second neighbouring sensing element of the plurality of sensing elements of the chain or to the control element via one of the first or the second interfaces. a plurality of sensing elements configured when deployed to be connected together to form a chain; a control element configured when deployed to be connected to the plurality of sensing elements of the chain, and each of the plurality of sensing elements comprises: a housing, first and second interfaces (20, 22), each of the first and the second interfaces being configured to form an electrical and a physical connection to a corresponding interface of another of the plurality of sensing elements or the control element to form the chain; electrical circuitry formed within the housing, the electrical circuitry comprising at least one sensor configured to generate an indication of a relative orientation and tilt of the sensing element, control circuitry configured to control communication of signals via one or both of the first interface and the second interface to at least one of the other sensing elements and/or the control element, a housing, first and second interfaces (20, 22), each of the first and the second interfaces being configured to form an electrical and a physical connection to a corresponding interface of another of the plurality of sensing elements or the control element to form the chain; electrical circuitry formed within the housing, the electrical circuitry comprising at least one sensor configured to generate an indication of a relative orientation and tilt of the sensing element, control circuitry configured to control communication of signals via one or both of the first interface and the second interface to at least one of the other sensing elements and/or the control element, at least one sensor configured to generate an indication of a relative orientation and tilt of the sensing element, control circuitry configured to control communication of signals via one or both of the first interface and the second interface to at least one of the other sensing elements and/or the control element, wherein the signals communicated via one or both of the first interface and the second interface to the at least one of the other sensing elements and/or the control element include an identification signal for identifying the sensing element and the indication representing the orientation and the tilt of each of the plurality of sensing elements in the chain, and characterised in that the control element is configured to identify the order of the plurality of sensing elements based on the control circuitry of each of the plurality of sensing elements communicating a respective identification signal of the respective sensing element to a first or second neighbouring sensing element of the plurality of sensing elements of the chain or to the control element via one of the first or the second interfaces.