The U.S. Geological Survey San Francisco Bay Estuary Field Station wishes to purchase the following items: GPS GNSS Rover Receiver, GLONASS tracking, extended warranty, NMEA out option and AC/DC adapter, from Leica Geosystems. No other source can provide the data consistency needed for change detection in ongoing USGS programs. Use of another unit may compromise our ability to detect whether the detected changes were real or whether there were differences in error rates and/or inaccuracies associated with in different RTK GPS units. Should you believe your firm possesses a system that can supercede the issues stated, please contact Dick Paprocki, USGS Contract Specialist at (916) 278-9442 or [email protected], no later than September 8, 2010.

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