I just bought the helix 5 and have a few questions. First I have a smaller he piranahmax unit and was wondering if I kept it on the boat how close can I mount the transducers and will they interfere with each other? I have a small 1756 xpress and would like to keep the transducers in one area. I am also trying to figure out if the helix 5 si gps will accept a lakemaster chip? I know it will with the navionics gold but not sure about the other.