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###### Department of Commerce

###### National Oceanic and Atmospheric Administration

# AGENCY:

National Geodetic Survey (NGS), National Ocean Service (NOS), National Oceanic and Atmospheric Administration.

# ACTION:

Notice.

# SUMMARY:

                        This Notice announces a decision by the Federal Geographic Data Committee's Federal Geodetic Control Subcommittee, in accordance with the Office of Management and Budget, Circular A-16 (                        *http://www.whitehouse.gov/​omb/​circulars/​a016/​a016.html*), to affirm the Guam Vertical Datum of 2004 (GUVD 04) as the official civilian vertical datum for surveying and mapping activities for the island of Guam performed or financed by the Federal Government, and to the extent practicable, legally allowable and feasible, require that all Federal agencies, with the exception of those with specific military related applications, using or producing vertical height information undertake an orderly transition to GUVD 04.                    

# DATES:

Individuals or organizations wishing to submit comments on the adoption of GUVD 04 as the official civilian vertical datum for Guam should do so by February 23, 2009.

# ADDRESSES:

                        Written comments should be sent to the attention of David Doyle, Chief Geodetic Surveyor, Office of the National Geodetic Survey, National Ocean Service (N/NGS2), 1315 East-West Highway, #8815, Silver Spring, Maryland 20910, fax 301-713-4324, or via e-mail                         *Dave.Doyle@noaa.gov*.                    

# FOR FURTHER INFORMATION CONTACT:

                        Requests for additional information should be directed to David Doyle, Chief Geodetic Surveyor, National Geodetic Survey (N/NGS2), 1315 East-West Highway, Silver Spring, MD 20910;                         *Phone:*                         (301) 713-3178.                    

# SUPPLEMENTARY INFORMATION:

The National Ocean Service (NOS), National Geodetic Survey (NGS), has completed the definition and implementation of GUVD 04. GUVD 04 supersedes all previously published height systems determined by all Federal surveying and mapping agencies, with the exception of those specifically related to tidal datums and/or military applications. GUVD 04 heights are the result of a mathematical least squares general adjustment of the vertical control portion of the National Spatial Reference System (NSRS) and are derived from approximately 132 km of 1st-Order, Class II geodetic leveling observations undertaken specifically for this project. The basis for all GUVD 04 heights is Mean Sea Level, for the National Tidal Datum Epoch 1983-2001, as determined by the NOS Center for Operational Oceanographic Products and Services (CO-OPS), and published for the National Water Levels Observation Network (NWLON) bench mark number 163 0000 TIDAL 4 (2.170 meters), located in Apra Harbor.

                    GUVD 04 height information for individual geodetic control monuments is available in digital form, from the NGS Web site:                     *http://www.ngs.noaa.gov/​cgi-bin/​datasheet.prl*.                

Dated: December 30, 2008.

David B. Zilkoski,

Director, National Geodetic Survey, National Ocean Service, National Oceanic and Atmospheric Administration.

[FR Doc. E9-1182 Filed 1-21-09; 8:45 am]

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