To be honest I had never really given that idea much thought.... I'm still really new to this whole electronic thing anyway... never could really afford it until I got up on my feet.. was lucky just to have my boat and some basic gear... the way my boat is set up I really don't know if multiple units would be an option? I have a 1860 tracker grizzly... its my duck boat as much as my fishing rig... its just a basic bones boat... just now wanting to really start upgrading to take the next step..I hope that answers some ?s