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Using a Third-Party Marine Monitor with a Garmin GPSMAP® 8500 / GPSMAP® 8530 Black Box
A third-party marine monitor can be used with a GPSMAP® 8500 / GPSMAP® 8530 Black Box but will not have touchscreen controls. To control the Black Box when a third-party monitor is connected, a GRID™ (Garmin Remote Input Device) will also need to be connected to the Garmin Marine Network.
For touchscreen control of a GPSMAP 8500 / 8530 Black Box, a Garmin Marine Monitor (GMM) will need to be connected to the main DVI-I video port and a Garmin Marine Network port on the Black Box. There are three Garmin Marine Monitors: