Seafloor mapping in the Monterey Bay National Marine Sanctuary by sidescan sonar and multibeam bathymetry has revealed new details about the geology, morphology, and active geologic processes. Collaborative data from physical samples, current moorings, and photographs of the sea bottom are consolidated with new and existing maps in a GIS. Via ArcView GIS, the in-progress GIS provides research project members a view of the relationship between individual data sets and those that are being developed by other project members. As a mature product, the GIS will be published in CD-ROM format to make data available to support economic and social policy making in this protected environment.