Been saying the same thing for years now, mechanical flashers work better as flashers but the price difference and extra capability of sonar units (use on a boat, graph view if you prefer old data vs real time, maps/gps etc) make them the preferred unit by many. Sonar units are closing the gap but I think the helix etc are still step behind(Marcum LX-7 is great but pay an arm and leg for it considering no gps/maps).
Once you have the knowledge/experience the historical graph shows you little useful information, real time data is key when ice fishing imo.
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