I have one in my dash. It has a gps built in. It was on the boat when I bought it so I don't know what all it will do. Can I get any software to work with it? It has an extra plug hanging off. Is this to plug up for a printout? Any thoughts would be appreciated. Whats everybody's opinion on this unit? I like it but I don't know how old it is or if it was top notch when it came out or what.