I want to run the lcx15-mt in duel frequency mode/ split screen. While in this mode I want to zoom only on the 200k side, if you zoom it zooms on both sides, lowrance says that is how it is. I understand you used to be able to do this on the 350a? I want the wide angle 50khz on normal to see the area and water column while zooming on the 200khz side to see my jig and any fish interested. Anybody found a work around for this?