Well the only true test is to catch what is under the sonar and see...but there are some indicators that tell you what you are looking at. Crappie and white bass will stack up on top of each other.....bass will not do that. White bass can be so thick that your sonar screen will look like strings of spaghetti.......noodles....but on occasion crappie will look like that also.....so you have to catch something to see what is down there. Bluegill and shell cracker will hang very close to the bottom and be a smaller dot on di than say a crappie or white bass. I have only had my Mega unit for a little over 2 months. I do not have a good di image of a bait ball with it. You get out on the water and you see something and you get excited about fishing and you forget to hit snapshot. I do have a great image from my old HB 899 unit that shows a group of white bass feeding on a shad ball. It would be the same on a Mega unit just much clearer image. Bait balls often times look like a cloud almost....tightly grouped together. In my image there happens to be fish feeding on the bait ball.....but there will be many times you find a bait ball and there will be nothing around it. The more you are on the water with the unit you will get the experience and just by looking you will be able to tell with 90 percent certainty what specie youre looking at on the screen. I am fishing the next couple of days so may get some good bait ball shots with the Helix.
Regards
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