If you do go with the bird some of them had a 2 cord transducer which was a pain. One cord was the actual transducer cable the other cord was a just a lanyard. The two cords would sometimes cause the transducer to sit off kilter and give a crappy return of what was down there.
Also keep the head unit from bouncing around or any vibration like a sled being pulled over the ice. Also be gentle with the transducer dont tap it on the skim of ice or floating chunks in the hole to get it to sink. This goes with all units but especially the birds and it should last a few years longer.
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