Overview
The APACHE 4 is an Unmanned Surface Vessel (USV) designed for hydrographic surveys and construction. It supports various Acoustic Doppler Current Profiler (ADCP) systems, offering high navigational accuracy and stable hovering for water flow velocity and discharge measurements. Its compact design allows for easy handling, safe launching, and convenient transportation.

Navigation and Control
The APACHE 4 features an advanced navigation controller that enables autonomous operation. It can navigate straight along cross-sections and hover stably in turbulent flows, improving flow estimation accuracy. The built-in GNSS+IMU module ensures reliable positioning even in challenging environments.

Sounding and Data Collection
Equipped with a built-in single-beam echo sounder, the APACHE 4 verifies ADCP bottom tracking data and provides water depth profiles. It supports data collection and post-processing, coordinate conversion, and path planning through the HydroSurvey and AutoPlanner software suite.

Positioning and Communication
The USV offers stable positioning and heading data to the ADCP and autopilot, even during GNSS signal loss. It includes an obstacle avoidance radar system and live video feed for safe operations. Communication is facilitated through integrated 4G modem, UHF radio, and various data formats.

Specifications
- Weight: 9 kg (without instrument and battery)
- Maximum payload: 30 kg
- Maximum speed: 5 m/s
- Battery endurance: 2 x 2 hours at 2 m/s
- Water proof: IP65
- Remote control range: 1 km
- Material: Macromolecule polyester carbon fiber

Applications
The APACHE 4 is ideal for obtaining high-quality data in areas where manned boat access is impractical, such as near dam structures or during flood level measurements. It is compatible with leading ADCPs like M9, RTDP 1200, RiverPro, and RiverRay, providing a portable and affordable unmanned solution for hydrologists.