has anyone fished from dock or shore with portable fish finder and if so, how does it work?

humminbird and a few others make a portable fish finder that works like others by identifying objects through sound waves. the ability to fish from shore comes from the transmitter thats casted by the fisherman and trolled over water surface and signals are sent to fisherman on shore who has a small reciever. has anyone used one of these devices???

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Are there any good portable fish finders on the market?

I take my son fishing to a couple of lakes and, because I don’t own a boat, I always rent one for the day.
Do you know if there are portable fish finders that can readily attach to a rented 4 person aluminum boat?
If so, where can I buy one.
Any help will be appreciated.

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Humminbird Wide Portable Fish Finder bottom reading not showing.?

All other features on my unit work except the bottom reading which shows the bottom structure in gray or black. I took it apart and went through every detail, but could not locate the problem. Anyone with the same problem or fix? Pretty expensive for a compatible unit $249.99. Please help.

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Anyone know of a good portable fish finder?

It’s for our jon boats. we will be switching boats from time to time so I need a portable. I want to keep it under 200 bucks. I would also like to know how to use the ones with the suction cup, does the transducer have to be in the water?, where do you stick the suction cup? Thanks!

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