1. Introduction
The Furuno FCV800 is an advanced Chirp Fishfinder designed to provide clear and detailed underwater views, enhancing your fishing experience. This manual provides essential information for the proper setup, operation, and maintenance of your FCV800 unit.

Figure 1: The Furuno FCV800 Chirp Fishfinder unit. The screen displays a sonar reading with fish arches and bottom structure, indicating a depth of 20.5 meters. To the right of the screen are control buttons including MODE, MENU/ESC, RANGE, GAIN, directional arrows, FUNC, MARK, and BRILL, along with a rotary knob for navigation.
2. Setup and Installation
Proper installation is crucial for optimal performance of your FCV800. This section outlines the basic steps for mounting and connecting the unit.
2.1 Mounting the Display Unit
The FCV800 is designed for transom mount installation. Ensure the mounting location is secure, provides clear visibility, and is protected from excessive spray. Use the supplied mounting bracket and hardware.
- Select a suitable location on the transom, ensuring no obstructions for the transducer signal.
- Mark and drill pilot holes for the mounting bracket.
- Secure the bracket firmly using the provided screws.
- Attach the FCV800 display unit to the mounting bracket, adjusting the viewing angle as needed.
2.2 Power Connection
The FCV800 operates on battery power. Connect the power cable to a 12V DC power source, ensuring correct polarity. It is recommended to install an inline fuse for protection.
- Connect the red wire to the positive (+) terminal of your 12V battery.
- Connect the black wire to the negative (-) terminal of your 12V battery.
- Ensure all connections are secure and waterproof.
2.3 Transducer Connection
Connect the transducer cable to the corresponding port on the back of the FCV800 unit. Ensure the connection is tight to prevent water ingress.
3. Operating Instructions
This section details the basic operation of your Furuno FCV800 Chirp Fishfinder.
3.1 Powering On/Off
- To power on: Press and hold the BRILL button (power symbol) located at the bottom right of the control panel until the unit powers on.
- To power off: Press and hold the BRILL button again until the unit powers off.
3.2 Basic Controls and Navigation
| Button | Function |
|---|---|
| MODE | Cycles through different display modes (e.g., Full Screen, Zoom, A-Scope). |
| MENU/ESC | Opens the main menu or exits the current menu/dialog. |
| RANGE | Adjusts the depth range displayed on the screen. |
| GAIN | Adjusts the sensitivity of the sonar receiver to enhance target detection. |
| Directional Arrows | Navigates through menus and adjusts settings. |
| FUNC | Accesses frequently used functions. |
| MARK | Marks a specific location or event on the display. |
| BRILL | Adjusts screen brightness and serves as the power button. |
3.3 Interpreting the Sonar Display
The FCV800 utilizes CHIRP technology for superior target separation and clarity. The display shows a real-time representation of the underwater environment.
- Bottom Line: The solid band at the bottom of the screen represents the seabed.
- Fish Arches: Curved shapes indicate fish. Larger, more distinct arches typically mean larger fish.
- Structure: Irregular shapes and patterns above the bottom line indicate underwater structures like rocks, wrecks, or vegetation.
- Depth Reading: The large numbers at the bottom left of the screen indicate the current depth (e.g., 20.5 m).
- Frequency: The top left corner displays the active frequency (e.g., CHIRP 125kHz).
4. Maintenance
Regular maintenance ensures the longevity and optimal performance of your FCV800.
- Cleaning: Wipe the display and unit exterior with a soft, damp cloth. Avoid abrasive cleaners or solvents.
- Transducer: Periodically inspect the transducer for marine growth or damage. Clean gently with a soft brush if necessary.
- Connections: Ensure all cable connections remain tight and free of corrosion.
- Storage: When not in use for extended periods, store the unit in a dry, cool place, disconnected from power.
5. Troubleshooting
This section addresses common issues you might encounter with your FCV800.
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not power on. | No power, loose connection, blown fuse. | Check power cable connections. Verify battery charge. Inspect and replace fuse if necessary. |
| No sonar image or erratic readings. | Transducer not connected, air bubbles under transducer, dirty transducer, incorrect settings. | Ensure transducer is securely connected. Check transducer placement for air bubbles. Clean transducer face. Adjust GAIN and RANGE settings. |
| Screen is dim or unreadable. | Brightness setting too low. | Press the BRILL button to adjust screen brightness. |
If the problem persists after attempting these solutions, please contact Furuno customer support.
6. Specifications
Key technical specifications for the Furuno FCV800 Chirp Fishfinder:
- Brand: Furuno
- Model Name: FCV800
- Power Source: Battery Powered (12V DC recommended)
- Screen Size: 7 Inches
- Display Type: LCD or LED
- Maximum Measuring Depth: 200 Meters
- Mounting Type: Transom Mount
- UPC: 611679401663
- ASIN: B0DM3JMDZ8
7. Warranty and Support
Furuno products are manufactured to high-quality standards and come with a limited warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Furuno website.
For technical support, service, or parts inquiries, please contact Furuno customer service through their official channels. When contacting support, please have your model number (FCV800) and serial number (if applicable) ready.
Online Resources: For the latest software updates, FAQs, and additional support documentation, please visit the official Furuno website.





