I don't have a Hbird, I have Lowrances; but they are gen2's, not gen3's. Shouldn't matter though about the gen model.
I can't say that you'll see anything stellar in shallow water, I have one mounted on the trolling motor that I use when shallow and I've finally learned to decipher what it's showing me. For someone that hasn't used on before it would just be a jumbled mess of lines.
Some of the new transducers are giving better images; but I don't have the money to blow to experiment with them, so I'll keep using what I have. I'll post some pics and try to tell you what the screen is showing, these aren't going to be "WOW, just for the Internet pics". They are real life pics, so don't expect much.
My lss1 trolling mounted transducer. Speeds on all of these were 1.2mph according to my Terrova remote.
Tires. Bank on the left.
This is as shallow as I can get. The white splotches are rocks.
Black line on the right is a tree shadow. White splotches on the left are rocks. Bank on the right where the info turns black.