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 The U.S. Coast Guard and the Louisville District U.S. Army Corps of Engineers have constructed a DGPS (Differential Global Positioning System) beacon receiver and transmitter.  The site will be known as the “Louisville” beacon.  It is located approximately 30 miles southeast of Louisville, Kentucky near Taylorsville Lake.  Presently the status of the beacon is “On-Air”, however, temporary interruptions may occur. The precise coordinates for the beacon receiver are:

Antenna/Monitor A Antenna/Monitor B
latitude 38 00.61772 N
longitude 85 17.92857 W
ellipsoid height 191.154m
latitude 38 00.63180 N
longitude 85 17.92233 W
ellipsoid height 190.691m


Transmission Frequency: 290.0 kHz
Signal Strength: 100uV at 150 SM
Transmission Rate: 200bps

The accuracy of the differentially corrected GPS signal is specified to be within 10 meters 95% of the time, (actual accuracy achieved by the use may depend on the quality of their equipment and their distance for the DGPS site, but is typically 0.5 to 1.5 meters).

Differential corrections are based on WGS84 ellipsoid position of the reference station antennas. The DGPS correction broadcast conforms to RTMC Type 9-3 correction message.