NOAA intends to award a sole source purchase order to Duncan-Parnell, Inc. for ten Trimble R980 Real-Time Receiver Systems for the National Geodetic Survey Division in Silver Spring, MD. The sole source justification is that Duncan-Parnell is the only authorized Trimble reseller for Virginia, and the receivers must integrate with existing Trimble equipment and software. Market research found no other US-manufactured real-time receivers meeting accuracy needs. This notice is not a request for competitive proposals, but interested firms may submit substantiating documentation to be considered for a competitive procurement. Oral communications are not accepted.