DEPARTMENT OF THE ARMY
ETL 1110-1-184
U. S. Army Corps of Engineers
CECW-EP
Washington, D.C. 20314-1000
Technical Letter
No. 1110-1-184
01 October 1998
Engineering and Design
USE OF THE U.S. COAST GUARD DIFFERENTIAL GLOBAL
POSITIONING SYSTEM AND THE CONTINUOUSLY OPERATING REFERENCE
STATION SYSTEM
1. Purpose. This technical letter provides guidance and
procedures on the use of the U.S. Coast Guard's (USCG)
Radiobeacon Differential Global Positioning System (DGPS) and the
National Geodetic Survey's (NGS) Continuously Operating Reference
Station (CORS) System. Procedures and equipment required for
for U.S. Army Corps of Engineers (USACE) access to these systems
are defined.
2. Applicability. This technical letter is applicable to USACE
commands having civil works, military construction, and
environmental restoration responsibilities.
References.
3.
a. USCG Navigation Center (NAVCEN) Web site
http://www.navcen.uscg.mil.
b. National Geodetic Survey CORS Web Site
http://www.ngs.noaa.gov/CORS/cors-data.html.
c. EM 1110-1-1003, NAVSTAR Global Positioning System
Surveying, 1 August 1996.
4. Distribution.
Approved for public release; distribution is
unlimited.
5.
Background.
a. The NAVSTAR Global Positioning System (GPS) is a real-
time, all-weather, 24-hour, worldwide, 3-dimensional absolute
satellite-based positioning and navigation system developed by
the U.S. Department of Defense. This system consists of two
positioning services: the Precise Positioning Service (PPS) and
the Standard Positioning Service (SPS). PPS was developed for
the U.S. military and other authorized users, uses the P(Y)-code
on the L1 and L2 carriers, and provides an accuracy of 16 meters.
SPS is available to civilian users, uses the C/A-code on the L1
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