BTM

bathymetric terrain model

CCOM

Center for Coastal and Ocean Mapping

ECS

extended continental shelf

GCS

geographic coordinate system

GIS

geographic information system

HIPS

hydrographic information processing system

JHC

Joint Hydrographic Center

NCEI

National Centers for Environmental Information

NOAA

National Oceanic and Atmospheric Administration

NRC

U.S. Nuclear Regulatory Commission

NGDC

National Geophysical Data Center

UNH

University of New Hampshire

USGS

U.S. Geological Survey

WMS

Web mapping service