Depends? depends on what is important to you. if you want mulitiple screens or live weather report , music, , photos of ports , anchorges, etc.. then the E-80 is worth the money. I dont believe that the fishing funtcions or the ablility to navigate are different between the two units. I would like to have it for the ablitiy to install two units. that way I could have a better look at the finder while I am out back fishing, but for a grand I could buy a really nice stand alone unit for out back and a hand held control for my auto pilot.