Got a question for y'all. I got a lowrance touch 9 unit. Heading fishing to a lake I know little about. My father in law has plenty of waypoints marked from this lake and has them downloaded onto a SD card. Only thing is he has every lake he has ever fished loaded on the same card. I know the card has over 5 GBs of info on it. I don't need but a bergs small portion of the cards memory. So to my question, is it possible for my unit to read the card and show me the waypoints without downloading it to the hard drive. If not how much hard drive does a unit have and would 6 GBs be to much to store on one