Trimble  SPS 751/851 Designed as an upgradeable solution, the Trimble SPS 751 and SPS 851 Modular GPS Receivers are suited for use as construction base stations and vehicle-mounted rovers for site supervisors. With the ability to upgrade with L5 GPS and GLONASS capabilities, the SPS 751 and SPS 851 offer an economical solution by allowing contractors to stay within their budget. With a modular design, the SPS 751 and SPS 851 combine the GPS receiver, radio, battery, displayand keyboard in a single housing. Optimized GPS and radio antennas can then be mounted outside in a high clear location for best performance and maximum range. SPS 751          Call for quote SPS 851          Call for quote Trimble  SPS 781/881 With the SPS781 and SPS881 Smart GPS Antennas, Trimble has built on the success of the SPS780 and SPS 880 models by designing an upgradeable solution for site measurement and stakeout applications. The SPS781 and SPS 881 can be used either as a rover or in a base station configuration to support site positioning and grade control operations. With the ability to upgrade with L5 GPS and GLONASS capabilities, the SPS781 and SPS881 offer a lower price point of entry while also offering the ability to upgrade the features of the rover. The Trimble SPS781 Basic and Max models now include the new Trimble RTK engine and are also equipped with Autobase functionality. The new Trimble RTK engine improves performance under tree canopy and reduces initialization time after loss of lock making the receiver faster and more productive. SPS 781          Call for quote SPS881          Call for quote