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I would get a vex or marcum and use the hummingbird as a backup
As others have said Macrum and Vex's will not interfere with Humminbirds because birds run on a different signal.
I don't know about that. I fished a couple years ago with a buddy, I have the ice-45 and he had an fl-8, we were set in holes about 20 ft apart and I was getting some interference from him and he got none from me. He moved to another spot about 50 ft away and the interference went away. That was the only time I ever got any interference on my 'bird and I've fished with guys with vex's and marcums.
Interesting. You have my mind thinking now. I might have to put my Humminbird and Marcum to the test this weekend. I have fished with a Humminbird near and didn't see interference but that's not to say I didn't miss it.