SonTek, a Xylem brand
88 RiverSurveyor S5/M9 System Manual (February 2013)
• RTK Quality GPS provides 0.03 m accuracy
• Differential Quality GPS provides sub 1-meter accuracy
• GGA Uncorrected provides greater that 1-m accuracy
VTG is the GPS vector track and speed over ground data string for the system. The VTG (Vec-
tor track and speed over ground) data string presents Track and ground speed information (boat
speed over the water) as well as other information. There are four icons (below) for VTG rang-
ing from Measured Velocity (blue) to Inactive (grey).
*Acceptable for discharge measurements but additional GPS parameters should be
monitored for guidance.
See Appendix D—Troubleshooting for additional guidance on using VTG data.
Depth Reference refers to the method used to measure depth. The RiverSurveyor presents two
options for Depth Reference: Vertical Beam (using the echo sounder) and Bottom Track (using
the velocity transducers). The indicator for no depth lock is the red icon, meaning that water
depth cannot be determined. The grey icon below indicates the depth reference is not available.
System Connection indicates that the system is connected and communicating with external
sources (PC or Mobile device).
System Connected
System Battery is monitored using the status icons indicated below. Typically, a fully charged
battery pack has about 5 hours of use. The icons below indicate battery status ranging from 10
to 100%. Users are advised to change the system battery immediately after reaching the 10%
level in order to prevent loss of data. If applying a direct power source to the ADP the icon be-
low will still be applied and with 17 V applicable to 100% and 12 V corresponding to 10%.
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