Why is Only One of my JL Audio MediaMaster Receivers Showing?

At the time of manufacture all JL Audio systems are given an internal name this is known in the industry as an instance. All devices coming off the assembly line will be programmed with the same instance name as an example 00 or 01. The instance is used to identify the device and its place in importance in the boat's systems.  If two JL Audio MediaMaster receivers are installed on the same vessel one of these will need to be reprogrammed to list the internal name differently.  Customers should contact JL Audio 1-954-443-1100 or their local installer for assistance a NMEA 2000 Network Gateway device will be necessary to re-program the radio.