Digital Flasher Posts Sonar Why Choose MarCum As Your Ice Fishing Flasher 12/06/2021 / 12/14/2021 by marcum-tech know. First off, there are a lot of terms that are used in the ice fishing industry to describe the functionality of ice fishing electronics. Terms such as high frequency, chirp, live imaging, target separation, target identification, interference rejection, zoom and so on are used to describe the performance of the ice units. Read more » Ice Fishing Flasher Interference Rejection Sonar Split Screen Steve Mattson Target Seperation Zoom