My eagle fish finder crapped out about a month ago....4 days left on the warrenty....they sent me an upgraded lawrance unit as it's replacement and it takes a micro sd chip.My old chip is 5 or 6 years old and is the bigger sd chip but has served me well and is available to anyone on this site if you can use it...it is free ....it is old enough that it does not have all the lakes but does winnie very well.polebreaker