In the Aquadopp IM300, we have integrated a Seabird Inductive Modem Module (IMM) into the standard Aquadopp. This system is designed for operation on long mooring cables with the data being transferred along the jacketed steel cable to a controlling modem that is located in a surface buoy or similar. The Aquadopp IM300 consists of a series of mechanical, electrical, and firmware changes to the Aquadopp but can be operated also as a standard system if the inductive modem is not needed.