SonTek, a Xylem brand
8 RiverSurveyor S5/M9 System Manual (February 2013)
2.3.2. SonTek DGPS - Optional
The DGPS option provides sub meter differential GPS positioning data to the ADP. The Blue-
tooth or Spread Spectrum PCM includes a DGPS receiver and external antenna. No Base Sta-
tion is required for this option.
The GPS satellites communicate with the differential GPS receiver inside the PCM. The DGPS
data is received by the PCM at 10-Hz and transferred to the ADP’s internal memory for integra-
tion and processing. It is then transmitted along with the ADP data from the PCM to the PC or
Mobile device.
2.4. SonTek Hydroboard and HydroBoard II - Optional
The SonTek HydroBoard II (Figure 7) is specifically designed to be used with the S5 and M9
ADP systems. It has easy to use, drop-in installation mounts for the ADP and the PCM. Simply
insert the components into their corresponding mounts and tighten the thumb screws. The Hy-
droboard has two hydro-fins to provide increased stability. There are two embedded towing
mounts near the front as well as one in the rear for an optional drag chute to increase boat track
stability. A detailed description of the mounting procedure for the Hydroboard is explained in
Section 3.7.2.
Figure 7. SonTek HydroBoard II with Optional GPS
2.5. OceanScience Riverboat – Optional
The OceanScience Riverboat is available for use in environments with higher flow rates. It pro-
vides a stable device for accurate measurements by reducing pitch, roll and yaw in flows up to 3
m/s. The flared box design reduces nose-diving and allows for wider selection of acceptable
measurement sites.
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