NOAA TECHNICAL REPORTS National Ocean Survey Series

The National Ocean Survey (NOS) provides charts and related infoniation for the safe navigation of marine and air commerce. The survey also furnishes other Earth science data--from geodetic, hydro-graphic, oceanographic, geomagnetic, seismologic, gravimetric, and astronomic surveys, observations, investigations, and measurements--to protect life and property and to meet the needs of engineering, scientific, defense, commercial, and industrial interests. Because many of these reports deal with new practices and techniques, the views expressed are those of the authors and do not necessarily represent final survey policy. NOS series t!nM Technical Kenorts is a continuation of, and retains the consecutive numbering sequence of, the former series, Environmental Science Services Adninistration (ESSA) Technical Reports Coast and Geodetic Survey (CCGS), and the ear-lier series, C&CS Technical Bulletins