Simple question (or not). Flasher or sonar?

[Quicky]

I prefer a regular sonar because that is how my brain is wired. Having said that I did impulse buy a fish hunter fishfinder that is similar to what you are talking about. It connects via bluetooth to your phone but it did not do so well when ice fishing. Even a little speck of water on the antenna causes it to disconnect. And my phone battery got eaten up pretty quick. I would stick with hard wired ones for ice fishing.
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