I have the LOWRANCE HDS 10 GEN 1 and cant get it to read past 300 meters, up graded the software from lowrance site didnt help, the worst part is that it locks up and dosnt do anything...like it gets lost. When crossing back over the to shallower water it finds itself and is ok again. Im really not happy with it being a true BLUE water sounder, starting to think it really belongs in a BASS lake back in the USA.