Can you run a Garmin fish finder and a Humminbird on the same boat? What about Lowrance and Simrad? Mixing brands on one boat is more common than you'd think — here's what talks to what, and where compatibility ends.
What Marine Electronics Share via NMEA 2000
NMEA 2000 is a brand-agnostic standard — any certified device can share data with any other certified device on the same backbone. A Garmin GPS can send position data to a Humminbird chartplotter. A Lowrance AIS receiver feeds vessel positions to a Garmin MFD. An engine ECU from Mercury sends fuel data to a Simrad display. The standard works across brands for standard data types (GPS position, depth, speed, heading, engine data, AIS).
What NMEA 2000 does NOT share across brands: sonar data, side imaging data, live sonar feeds, or any proprietary manufacturer data type. The sonar picture from a Garmin transducer displays only on Garmin units; Humminbird's MEGA Live feeds only to Humminbird displays. Only standard data types (position, heading, depth, AIS) cross brand lines.
Common Mixed-Brand Configurations
Two fish finders, different brands: Common on tournament boats — a Garmin LiveScope on the bow (forward-facing live sonar), Humminbird MEGA SI on the console (side imaging). Both receive GPS position from the same NMEA 2000 network; neither sees the other's sonar data. Each unit operates its own sonar independently.
Chartplotter from one brand, AIS from another: AIS data from any NMEA 2000-connected receiver displays on any chartplotter. A Garmin chartplotter will display vessel overlays from an Actisense or Digital Yacht AIS receiver without brand-specific configuration.
VHF radio and GPS: A Standard Horizon or Icom VHF radio with DSC receives GPS position from any NMEA 2000-connected GPS source — your fish finder's GPS position feeds the VHF for DSC emergency broadcasting automatically.
Additional NMEA 2000 T-connectors and drop cables for adding more devices to an existing backbone — works between any certified brands.