Call for Expert Advice
0800 453 422
Official NZ Leica Geosystems Dealer
Free Shipping For Online
Orders Over $50

CHC Apache 4 USV


The APACHE 4 is an Unmanned Surface Vessel (USV) that supports a wide variety of Acoustic Doppler Current Profiler (ADCP) systems available on the market. It offers an unmanned operation solution with a shallow draft, high navigational accuracy, and stable hovering for hydrologists when measuring water flow velocity and discharge of a current section. Very compact, it enables easy handling at the mission site, facilitates safe launching, and convenient transportation by car.

The APACHE 4 USV brings together the best of high-accuracy positioning and automated navigation control technology built around the operator’s habits when conducting ADCP hydrographic cross[1]section flow measurements. The built-in adaptive water flow and hovering navigation technology significantly improve the accuracy of flow estimation. Even when GNSS positioning might be degraded by the obstructed environment, the internal GNSS+IMU module continues to provide a reliable position and heading for the ADCP and autopilot controller.

The APACHE 4 is a perfect solution for obtaining high-quality data for flow and velocity measurements in water where manned boat access is impractical, such as in front of dam structures, or where safety is a concern, such as during flood level measurements.

Additionally to the standard package that includes the remote control boat, single beam echosounder, and GNSS IMU sensor, the Apache 4 USV can be equipped and delivered with the Teledyne Riverray or Riverpro, Sontek M9 or ROWE Seaprofiler ADCP for water discharge management, and with the CHCNAV’s sidescan module used for the underwater object detection, or with the CHCNAV’s water quality assessment sensor to measure water quality parameters. The obtained data can be effectively used by researchers and engineers.

Advanced navigation controller
Integrated adaptive water flow straight-line and hovering technology
The autonomous control system enables APACHE 4 to navigate straight along the cross-section according to the profile view when the flow rate, turbulence, etc., changes. The hovering technology can make APACHE 4 hover stably in the turbulent flow at the start and end points of ADCP observation, thereby improving the accuracy of flow estimation.

Compatible with common ADCPS
Versatile. Carries up to 35 kg of payload
The APACHE 4 central access shaft design provides unmanned cross-sectional flow measurement solutions for the leading ADCPs on the market. The APACHE 4 is particularly suited for hydrologists using ADCP sensors such as the M9, RTDP 1200, RiverPro, and RiverRay, who are looking for an integrated, portable, and affordable unmanned solution. It does not only carry the ADCP but also provides its positioning, orientation, power, waterproofing, network, and 4G transmission solutions.

Built-in single beam echo sounder
Expand your unmanned survey capability
Single beam sounding data can be used to verify the accuracy of ADCP bottom tracking data and even fed directly into the ADCP flow measurement software to compensate for the unavailability of ADCP data, and at the same time, provides water depth profile data associated with the flow velocity profile measurement.

Smart positioning and navigation
Uninterrupted positioning with GNSS+IMU
APACHE 4 provides a stable position and heading to the ADCP and autopilot. Its IMU sensor ensures the availability of position data even during momentary GNSS signal loss. The obstacle avoidance radar system and live video feed ensure safe operations in case of loss of visibility or difficult environmental conditions. Completely autonomous, the APACHE 4 is safely operated from the shore. The AutoPlanner and HydroSurvey software suite allows the operator to define the entire mission, from the survey area to the export of the results.