I have a card that I am using for that,do I need to clean the stuff that is already on the unit off the card or will it filter that out when I put more updates on it? Everything that is on it came from the site where I regiistered the unit, or the waypoints I transfered from my Lowrance unit, have 1 of each, figure that.....
I am not sure if the updates took though. I put the card in and it acted like it was but it never said it did or anything. I put the card back in and it did the same thing.