This listing is for a used GCV10 and a USED GT30-TM.
We hooked this unit up to a 8610 display to update the software. We test both SideVu and ClearVu functions and found them to be working.

Overview:
GCV10
• Sonar Technology: CHIRP ClearVu and SideVu high-frequency scanning sonar
• Frequencies: Operates at 455/800 kHz
• Transmit Power: 500W RMS per channel (1500W total)
• Max Depth Range: Up to 750 feet for ClearVu and 500 feet for SideVu
• Networking: Features 3 built-in Garmin Marine Network ports to share sonar data across multiple chartplotters
• Power Input: 10–35V DC (10.5W max usage, 4.0A fuse)

GT30-TM
• Power Rating: 500 W per element (1,500 W total)
• Frequencies & Depth Capabilities:
• CHIRP ClearVu: 260/455 kHz (up to 1,000 ft max depth), 455/800 kHz (up to 500 ft max depth), and Ultra-High Definition 800 kHz (up to 200 ft max depth)
• CHIRP SideVu: 260/455 kHz (up to 750 ft max depth), 455/800 kHz (up to 500 ft max depth), and Ultra-High Definition 1200 kHz (up to 30 ft max depth)
• Cable Length: 20 feet (6 meters) with a built-in fast-response temperature sensor
• Transom Angle: Accommodates 0° to 70° transom angles