I have a used 840 system. It includes display unitand mounting bracket, probe, power cable and transducer. Display unit and probe were recently sent back to fishhawk for verification of proper operation. Came on the boat I bought and have a different system I plan to use.
Only thing that does not work is the surface speed on the transducer which I was told by fishhawk typically wear out.
$300 obo
PM me for any more info
Located in Clay NY