Final answer:
GPS is the odd one out among the terms since it is used for surface navigation rather than underwater mapping.
Step-by-step explanation:
Among the terms SeaBeam, Global Positioning System (GPS), GLORIA, Sea MARC, and Precision Depth Recorder (PDR), we are tasked with determining which one does not fit the pattern. SeaBeam, GLORIA, and Sea MARC are tools used for undersea mapping and exploration, which help in detailing the seafloor's topography. The Precision Depth Recorder (PDR) is also related to measuring underwater depth. The Global Positioning System (GPS), however, differs from the others as it is primarily used for navigation and determining positions on the earth's surface with the help of satellites. Therefore, GPS does not fit the pattern as it's not a tool for underwater mapping but rather for surface positioning.