Re: lowrance lvr 800 compatibility
The LVR-800 has both NMEA2000 and NMEA0183. If your Humminbird does not have NMEA2000, you can use NMEA0183 which it should have. If you look on page 12 of the LVR Installation Instructions it shows how to connect to the NMEA0183. You'll also have to check the manual for the Humminbird to see what wires to connect to on that unit.
When you have it connected, make sure to go into the radio setup and select NMEA0183 so that the LVR knows to actually use the NMEA 0183 connections for its GPS input.
Hope this helps,
Ken