Introduction
Geodetic Global Positioning Systems are used in all aspects of our terrestrial and hydrographic-based mapping programs. We combine the Trimble 5700 series of survey-grade GPS receivers with high-gain radio data links to provide superior accuracy and efficiency.

RTK-GPS for Realtime Tide Measurement	RTK-GPS for Rapid Topographic Mapping
RTK-GPS for Beach Profiling	RTK-GPS for Static Surveys
Technical Specifications

GLOBAL POSITION SYSTEMS • Trimble 5700 dual frequency GPS system & RTK-Basestation o Instrument used for topo/bathy positioning and tidal corrections o High precision L1 and L2 measurements o 24 channels L1 C/A code, L1/L2 full cycle carrier o Extremely low latency (20 milliseconds) o RTK-GPS accuracy depends on conditions such as multipath, obstructions, satellite geometry, atmospheric parameters and basestation control quality. - Published horizontal accuracy: 10 mm + 1ppm RMS - Published vertical accuracy: 20 mm + 1ppm RMS o 2 5700 Series RTK-GPS Rover systems o 2 Ruggedized TSC1 data logger o 5db High-gain RTK broadcast antenna