Quote Originally Posted by Humminbird_Greg View Post
You can also try performing a full format on the SD card and try it again. Most formatters default to a quick format. Take the extra time and perform a full format and see if it helps.
Greg that is what I have had to do 3 times. After formatting the cards they work same as a new one. I keep three in the boat, one in both units. Then one for a backup. Love my humminbirds, but thinking about trying something new this time around.
Pete