Technology is an ever changing world. As fast as products come out the faster they become archaic. Yep, I had to upgrade (replace) my first and second USB MMC card readers. I guess this is the price for we pay for living in the world of computers. but the price is small compared to the advancement for functions. Thanks to a forum like this we have the expertise of folks who can help identify the need to upgrade and get on with the world of sonar scanning. Chuck