Tracker ... here's the listing for what Navionics map chips are compatible with a Elite 5 DSI :

http://lib.store.yahoo.net/lib/landf...ilityGuide.pdf

I doubt they'll take it back, from wherever you bought it ... so you'll likely have to try & sell it on the Personal Classifieds Forum (or mention it on your state forum), and try & get most of your money back.

... cp