gua_50m.shp
Source Bathymetry: Chamberlin, C., 2008. A digital elevation model of Guam for tsunami inundation modeling, NOAA Pacific Marine Environmental Laboratory technical report, Seattle, WA, 7 pp.
http://www.ngdc.noaa.gov/dem/squareCellGrid/download/586
Process: Contour was derived from the mosaic bathymetry using the contour tool of ArcGIS (version 10.1) by Esri.
File Location: PICMAKAI\GIS\GIS\Data\MARIANAS\Basemaps\Bathymetry\OutsideDataSources\CSC\guam_1_3s_WGS84_UTM55N.img

gal_50m.shp
Source Bathymetry: Gridded bathymetry of Galvez Banks, S. Galvez Bak, and 11-Mile Reef, Territory of Guam, USA
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_gal_bathy.htm
Process: Contour was derived from the gridded bathymetry using the contour tool of ArcGIS (version 10.1) by Esri.
File Locations: 
Galvez - PICMAKAI\GIS\GIS\Data\MARIANAS\Basemaps\Bathymetry\Multibeam\_archive\2010-June-18\gal_5m_100m
N. Galvez (11-Mile Reef) - PICMAKAI\GIS\GIS\Data\MARIANAS\Basemaps\Bathymetry\Multibeam\_archive\2010-June-18\ngal5m
S. Galvez - PICMAKAI\GIS\GIS\Data\MARIANAS\Basemaps\Bathymetry\Multibeam\_archive\2010-June-18\sgal5m