location of coastal maps.

Does anyone know of any coastal maps of the U.S. on the Internet or
anywhere else that work well with grass? I'm looking for bathymetry
maps, sea surface temperature, pollution or anything really. Thanks.

                                    Shaun S. Poulton
                                    National Marine Fisheries Service
                                    spoulton@solidsparc.ssp.nmfs.gov
                                    (301)713-2372