I am trying to look through this fiber optic cable, and can't see your screen.... :-)

May be post a link to the NOAA dataset you are referring to - NOAA publishes tens of thousands of datasets, from very fine details of shorelines to global ocean datasets. Might also mention the extents of your area of interest. By shapefile, do you mean the coastlines, depth contour lines, etc.? Are you familiar with GIS?