The Lowrance and the Icom are pretty happy together. The Lowrance causes a slight amount of interference on the VHF on certain channels. I've loaded all the wires with ferritte cores, with the exception of the VHF antenna cable. I think the interference is coming out of the Lowrance display anyhow. You can block some of it with your hand or a sheet of metal.
The Lowrance is an LMS-337C DF and the Icom is an M422.