 But this was a decade or more before GPS existed, thus the processing load to keep an accurate picture of "where you are" was considerable.The GEONAV systems, which used DSOS (Frailey, 1975) as their operating system, performed the required navigation and, in addition, collected, processed and stored the seismic data being received in real-time.The name "Deep Six Operating System" was the brainchild of Phil Ward (subsequently a world-renowned GPS expert) who, at the time, was manager of the project and slightly skeptical of the computer science professor, Dennis Frailey, who insisted that an operating system was the solution to the problem at hand.