Maybe you guys are way ahead of me but the down image for Humminbird is here. The down load number for this is v4.750 Go to www.humminbird.com sign in and it will tell you how to do it. Its not hard I even did it. I you need help Skipeye is pretty when it comes to these things. Will do a better job than me explaining it. He may still be up in the clouds after becomming a grandpa this week.