Rifleman, I have a 798 w/upgraded transducer. HB claims the798 has the most clear screen (also the smallest) of any unit they have. I have watched some of the videos on you tube on fine tuning the unit. Fish show up as white specks, but I have yet to see any on the bottom. My answer is no, it wont show big fish on the bottom. On the side imaging it will show suspended fish w/shadows on the bottom. I don't really even look @ DI anymore. I've never been able to get it to show pics like whats on the side of the box. Kinda like when you order that meal thats in the picture on the counter & when you gey it, it doesn't look like the picture. If it's not to late, exchange that unit for something w/side imaging. That will change your fishing life. Well worth the money. Opens up a whole new world.
Don't lie, There's less you have to remember