The original data was created as follows: Compiled and digitized by Ogden Environmental in 1994 in Arc/Info version 6.1.2 using the Marine Atlas of the Hawaiian Islands by A.P. Balder, 1992. The process was supplemented with 600 foot contours on USGS quads, where available. Source maps varied in scale from 1:80,000 to 1:600,000, with RMS errors varying from .002 to .010.