I have a friend looking to sell a Furuno GP-36 DGPS.
It has a chart plotter but no map overlay. He only used it for 2 seasons. It is a great unit if you just want the basics. Plus it may contain a few Cape May hot spots!
I'm not sure what he is asking for it but if you are interested let me know and I'll contact him. I had the same unit and I think it was $650 new.