Electronic heading sensors; ultrasonic application measuring and searching machines; digital communication type remote measuring and controlling machines and instruments; computer software (including computer software which is recorded in some recorded media, including CD-ROM's and magnetic discs); depth sensors; acoustic release devices; depth control devices using electronic sensors for use in towing underwater cables; connectors for attaching depth control devices using electronic sensors ...

electronic survey and position detection systems and components therefor; namely, compasses, underwater sonic transducers, computer program software, and radio communication equipment; namely, receivers and transmitters

DIGITAL READOUT ELECTRONIC COMPASS