I would steer clear of Eagle as most, if not all, can not be networked. I have heard good and bad about Low and Bird. I run low units and would like to be able to afford the new HDS10 with sturcture scan but I am a poor boy. There is a website that has lots of chatter about df/gps units. You might want to go there and do some reading. There is lots of info. It is bassboatscentral.