1. Introduction
The FIFISH V6 Expert M100 is a professional underwater remotely operated vehicle (ROV) designed for various underwater missions and operations. It features enhanced design and performance, including corrosion and sand protection, 360° omni-directional mobility, and a stable recording system. This manual provides essential information for the safe and effective operation and maintenance of your FIFISH V6 Expert M100.
2. Package Contents
Verify that all items listed below are present in your package:
- FIFISH V6 Expert ROV
- Remote Controller
- 100m Tether & Spool
- VR Goggles with Head Tracking
- Portable EPP Case
- Controller Charger
- ROV Charger
- 128GB Micro SD Card (pre-installed)

Image: Components included in the FIFISH V6 Expert M100 package, showing the ROV, controller, tether, VR goggles, and chargers.
3. Setup
3.1 Charging the Devices
Before initial use, fully charge the ROV and the remote controller using their respective chargers. The ROV features a 14400 mAh battery for extended operation.
3.2 Connecting the Tether
Connect one end of the 100m tether to the ROV and the other end to the tether spool, which connects to the remote controller. Ensure connections are secure to prevent water ingress.
3.3 Controller and VR Goggles Setup
Power on the remote controller and connect your smartphone or tablet to it via Wi-Fi. Install the FIFISH app on your mobile device. For an immersive experience, connect the VR goggles to the controller and wear them. The VR goggles enable head tracking for intuitive ROV control.
4. Operating Instructions
4.1 Pre-Dive Checklist
- Ensure ROV and controller batteries are fully charged.
- Verify tether connections are secure and free of damage.
- Check propellers for any obstructions.
- Confirm the FIFISH app is running and connected.
4.2 Launching the ROV
Gently place the FIFISH V6 Expert M100 into the water. Maintain a firm grip on the tether spool or controller until the ROV is stable in the water.
4.3 Basic Controls
Use the remote controller joysticks to maneuver the ROV. The FIFISH V6 Expert M100 offers 360° omni-directional mobility, allowing movement in all directions (forward, backward, up, down, left, right, and rotation). Refer to the in-app tutorial for detailed control schemes.

Image: Illustration of the FIFISH V6 Expert M100's 360° omni-directional movement capabilities underwater.
4.4 VR Intelligent Head Tracking
With the VR goggles, you can control the ROV's direction and posture by simply rotating your head. This feature provides an immersive control experience. Ensure the VR goggles are properly calibrated before use.

Image: Diagram showing a user wearing VR goggles and controlling the FIFISH V6 Expert M100's movement through head movements.
4.5 Camera and Lighting
The ROV is equipped with a 4K UHD camera and ultra-bright 6000 lumen LED lights. Use the FIFISH app to control camera functions (photo/video recording, settings) and adjust LED brightness. The 128GB Micro SD card allows for ample storage of high-resolution footage.

Image: Visual representation of the FIFISH V6 Expert M100's 4K UHD camera capabilities and the powerful 6000 lumen LED lights illuminating an underwater scene.
5. Features Overview
- Professional ROV Design: Streamlined and robust construction for corrosion and sand damage protection.
- 360° Omni-directional Mobility: Patented design for complete freedom of movement underwater.
- Advanced Stabilization System: Ensures smooth and stable footage even in challenging underwater conditions.
- Extended Dive Time: Up to 1.5 hours in 1 m/s currents and 6 hours in still waters.
- 4K UHD Camera: 12-megapixel resolution, 166° field of view, f/2.5 aperture, 240 fps slow-motion filming, DNG/JPEG image format support.
- 6000 Lumen LED Lights: Ultra-bright illumination for optimal clarity in dark underwater environments.
- VR Intelligent Head Tracking: Immersive control by rotating your head with the smart VR goggles.
- Multi-tool Compatibility: Interface for integrating various professional and industrial extension tools (e.g., observation, measurement, manipulator, sampling tools).
- 128GB Micro SD Card: Removable for easy data export and ample storage.
- 14400 mAh Battery: High-capacity battery with quick charging capability.

Image: The FIFISH V6 Expert M100 underwater drone operating in clear water, showcasing its design and functionality.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | QYSEA |
| Model Name | FIFISH V6 Expert M100 |
| Video Recording Resolution | 4K UHD 2160p |
| Effective Still Resolution | 12 MP |
| Connectivity Technology | Wi-Fi |
| Special Feature | Portable |
| Max Depth | 100 Meters |
| Battery Capacity | 14400 mAh (Lithium Polymer) |
| Operating Temperature | -10 to 60 Degrees Celsius |
| Supported Image Format | DNG, JPEG |
| Storage Media Type | SD (128GB included) |
7. Maintenance
7.1 After Each Use
- Rinse the ROV and tether thoroughly with fresh water to remove salt, sand, or debris.
- Inspect propellers for any entanglement or damage.
- Ensure all ports and connectors are clean and dry before storage.
7.2 Battery Care
- Store the ROV and controller with batteries charged to approximately 50-60% if not used for extended periods.
- Avoid fully discharging the battery.
- Charge in a well-ventilated area.
7.3 Storage
Store the FIFISH V6 Expert M100 in its portable EPP case in a cool, dry place, away from direct sunlight and extreme temperatures.
8. Troubleshooting
8.1 No Power
- Ensure the ROV and controller are fully charged.
- Check power buttons for proper engagement.
8.2 Connectivity Issues
- Verify Wi-Fi connection between the controller and your mobile device.
- Ensure the tether is securely connected to both the ROV and the controller.
- Restart the ROV, controller, and mobile app.
8.3 Poor Image/Video Quality
- Clean the camera lens.
- Ensure sufficient lighting using the ROV's LED lights.
- Check camera settings in the FIFISH app.
- Verify the Micro SD card is properly inserted and has sufficient space.
8.4 ROV Not Responding to Controls
- Check for propeller obstructions.
- Ensure the tether is not tangled or damaged.
- Verify controller battery level.
- Recalibrate VR goggles if using head tracking.
9. Warranty and Support
For detailed warranty information and technical support, please refer to the official QYSEA website or contact your authorized dealer. Keep your purchase receipt for warranty claims.







