I was speaking to the guru at harbour chandlery and he was saying the biggest bugaboo about all the new sounders is the auto sensitivity. The machines are just not propgramed to manage all the variables that our cosat throws at the machines. Fresh water layers, very fast depth changes, thermoclines and current rips etc. According to him its best to learn how to adjust the sensitivty on you machine to get the best out of it. A tip from me is to keep that Fish ID off its an insult to you angling mind and you mis alot more than you see due to electronic interpretation.