My fish finder in my boat is going out. It’s a Lowrance X22a. I’m looking to find a reasonable priced unit that will fit in the same spot in the boat. I have a Lowe and the finder is in the dash. I’ve been checking out the Lowrance X4 and X4 Pro. The only difference is the pro has 83/200khz Skimmer and the other only has the 200khz. Can anybody tell me if that would make that much of a difference. Thanks.