Introduction
Members of Geodynamics’ staff have been trained in Advanced ADCP & Hydroacoustic Applications by the USGS Office of Surface Water & Hydroacoustics. Whether you require shipboard ADCP work to calculate river discharge or tidal prism or need long-term deployments for directional waves spectra we rely on the RDI line of acoustical Doppler current profilers tailored to your specific needs. We lease and insure our RDI ADCP’s through Coastal Leasing of Cambridge, Massachusetts.

RDI Workhorse Sentenel (image USACE-FRF)	RDI Rio Grande mounted on Surfzone Explorer
Technical Specifications

ACOUSTIC DOPPLER CURRENT PROFILER o 600kHz or 1200kHz RD Instruments Workhorse Mariner with bottom track for shipboard applications or Workhorse Sentinel with flash memory for long-term deployments o Velocity resolution: 0.1cm/s o Number of depth cells: 1-128 o Ping rate: 2Hz

POSITIONING INSTRUMENTS • 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