Why Networking Matters
A networked fish finder does not operate in isolation. It shares sonar data, GPS waypoints, engine information, and transducer feeds with other compatible units on your boat via Ethernet or proprietary protocols. This means a console unit and a bow unit can display the same sonar feed, share waypoints in real time, and reduce the number of transducers needed.
Networking also enables integration with autopilots, radar, trolling motors, and VHF radios, creating a unified marine electronics system. For boats with more than one screen, networking is not a luxury — it is a practical necessity that eliminates duplicate hardware and simplifies operation.
The practical benefits are immediate: share one transducer's sonar feed to both your console and bow screens, automatically sync waypoints saved on one unit to every other unit on the network, and display engine data from NMEA 2000 sources on any screen. Without networking, each screen operates as an isolated unit, requiring its own transducer and manual waypoint transfer — doubling hardware costs and creating data silos.
Our Top Networked Units
Garmin GPSMAP 943xsv
Best Garmin Network Hub · 9-Inch
The GPSMAP 943xsv supports the Garmin Marine Network for sharing sonar, radar, and chart data between multiple displays. It connects via Ethernet to other GPSMAP and compatible ECHOMAP units. Built-in support for all Garmin transducers including LiveScope makes it a versatile network anchor.
Lowrance HDS PRO 9
Best Lowrance Network Unit · 9-Inch
The HDS PRO series supports Lowrance's NMEA 2000 and Ethernet networking, sharing sonar sources and ActiveTarget feeds across multiple displays. It connects to the Lowrance Ghost trolling motor, Power-Pole anchors, and Mercury VesselView engine data. A powerful network node for multi-screen setups.
Humminbird Apex 13
Best Humminbird Flagship · 13-Inch
The Apex 13 is Humminbird's top networked unit, supporting Ethernet networking, MEGA Live integration, MEGA 360 compatibility, and the One-Boat Network with Minn Kota and Rapala products. The 13-inch display provides massive screen real estate for multi-panel views of live sonar, mapping, and traditional sonar simultaneously.
Networking Protocols Explained
| Protocol | Used By | What It Does |
|---|---|---|
| NMEA 2000 | All major brands | Shares engine data, GPS, depth, wind, and fuel between devices from different manufacturers |
| Ethernet | Garmin, Lowrance, Humminbird | High-bandwidth sharing of sonar images, radar, and chart data between same-brand units |
| One-Boat Network | Humminbird + Minn Kota | Integrates trolling motor, shallow water anchors, and sonar into a unified control system |
| Garmin Marine Network | Garmin | Proprietary Ethernet network for sharing Garmin sonar, radar, and LiveScope between units |
Bottom Line
If you run multiple screens on your boat, networking pays for itself in reduced hardware, shared data, and unified control. Choose the ecosystem that matches your trolling motor and existing electronics — switching brands mid-network is expensive and disruptive.
Frequently Asked Questions
Can I network fish finders from different brands?
NMEA 2000 allows basic data sharing (depth, GPS, engine data) between brands. However, sonar image sharing and live sonar streaming require same-brand Ethernet networking. For full functionality, stick with one brand across your displays.
How many fish finders can I network together?
Most Ethernet networks support two to four displays sharing sonar and chart data. Garmin's Marine Network and Lowrance's Ethernet system both handle multi-unit setups. The practical limit is power draw and available mounting space rather than network capacity.
Do I need special cables for networking?
Yes. Ethernet networking requires manufacturer-specific Ethernet cables between units. NMEA 2000 uses a standardized backbone cable with T-connectors and terminators. Your boat's wiring harness may need to be extended to route cables cleanly between display locations.