Abstract: Described is a chondrichthyan repelling system comprising at least one fin comprising at least one electrically conductive electrode for connection to an electrical signal generator. In use, the electrical signal generator generates electrical signals to the at least one electrode to thereby radiate an electrical field which repels chondrichthyans. Also disclosed are various fin designs incorporating one or more electrodes, and a watercraft having one or more fins as described. Various means of connecting the electrodes to the electrical signal generator are also described.

Abstract: Described is a chondrichthyan repelling system comprising at least one fin comprising at least one electrically conductive electrode for connection to an electrical signal generator. In use, the electrical signal generator generates electrical signals to the at least one electrode to thereby radiate an electrical field which repels chondrichthyans. Also disclosed are various fin designs incorporating one or more electrodes, and a watercraft having one or more fins as described. Various means of connecting the electrodes to the electrical signal generator are also described.

Abstract: A location device includes a location detection and processing module, preferably a global positioning device for receiving satellite signals. Module outputs position data in the form of a digitally encoded signal to a control processor coupled to an activation device. The processor processes the signal and provides a signal to a voice synthesizer in a form the synthesizer can recognize and converts to a voice data signal stating the position in terms of latitude and longitude. The synthesizer sends that signal to a transmitter which transmits the signal as an over the air voice signal. The control processor may send the digitally encoded voice data to a transmitter or to a transmitter for direct transmission to a central authority. The device may include an activation module for activating the device response to a specific stimulus.