interfacing Raymarine to Furuno

[hammertime2]

Is there a way to interface a Raymarine E120 to a Furuno 582L? I would like to have the capability to have the navigation feature on the Furuno display

Not an issue. Take the NMEA0183 out the back of the E120 and connect to the MNEA0183 IN on the furuno.
You probably have to buy two cables; one that plugs into the NMEA plug on the 120 and one that plugs into the External Equipment port on the Furuno. Then connect NMEA + (OUT) on the E120 to NMEA - (IN) on the Furuno. For two-way comm, connect NMEA - (IN) on the E120 to NMEA + (OUT) on the Furuno. Be sure to connect the negatives (grounds) together on both units. Also, you'll probably have to go into the setup on both units and turn the ports and sentences on.