once the orientation sensor 70 is fitted within the cavity within the drive shoe then it will be necessary to cover the cavity to protect the sensor from the marine environment as the sensor will not be required to operate following the installation of the conductor it can be battery powered and thus there is no need to provide power to the sensor however the sensor and its battery power will be required to be very robust as the process of driving the conductor involves very heavy hammer impacts on the top end of the conductor which impacts travel through the wall of the conductor the sensors may comprise a plurality of gyroscopes or other sensing devices for the purposes of redundancy it may be desired to install more than one orientation sensor into a drive shoe the orientation sensors may be fitted into a single cavity or they may be distributed at different points around the circumference of the drive shoe fig5 shows a schematic depiction of a preferred embodiment of the present invention in this embodiment the orientation sensor s include a communications interface that sends information to a receiver unit 82 that is coupled to the upper end of the conductor the information is sent by causing vibrations to propagate through the body of the conductor for example as sonic or ultrasonic signals these signals are received by the receiver unit 82 which then relays the orientation data to the control unit 809 via a wireless or cable connection the orientation sensor s are secured within the cavity within the body of the conductor using an epoxy resin or similar fixative to ensure that there is a suitable coupling between the sensor.