The Garmin Striker 4 portable kit would work very well. The kit comes with a bag with a case, a 12v battery and the unit with the transducer. The transducer has a suction cup so it is very easy to attach and remove. I use it both for ice fishing and on my aluminum boat. It works well for ice fishing if you remove the suction cup but the transducer needs to be pointing straight down. It is a good unit that is $200, but can often be found for $180. There are many YouTube videos and articles about it, I would highly recommend it for the price.