Some form a dam from plumbers putty and fill with water.
I use a flyrod holder on the track of my yak to hold a metal rod/aluminum piece of metal to attach my transducer.
It is easy to swing up out of the way if beaching or shallow water. Totally portable and easy to pack away.
Humingbird portable fish finder contains battery.
DuFf
Looks and works something like this only DIY and Cheaper.(when Hummingbird is not in use I can use the extra Rod holder)
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