Fished West Rush yesterday about 6 feet away from a Bird 385 with my new Ice 55 in 28 feet of water. Signifigant interference picked up while I was on the 19 degree beam (240 Khz) on my Ice 55 regardless of what the 385 was set to (has 83 Khz, 200 Khz, and 83/200 modes). Only way to get rid of it was to switch mine to the 9 degree beam. 9 degrees was fine for fishing in 28 feet but I may be in trouble if I want to fish in shallower water with my 19 degree beam. I e-mailed Humminbird and will post their reply if and when I receive it.