Using my Humminbird 360, I"d pull up to my main waypoint and as soon as the rocks were on my screen I"d hit the spot lock on my Ultrex trolling motor. Once locked down, it was really easy to catch the fish. I'd just watch the screen, line up my cast with what the 360 was showing me, and put the bait right where I wanted it. Many times the cadence changes to make the fish bite. Once my weight was on the bottom and I felt the rocks I cast at, I'd shake the bait rapidly in place. If they didn't bite after a minute, I'd slow the shaking down. Sometimes they wanted it laying still and slowly sinking to the bottom. With a 15" leader, it would only take a few seconds for your bait to drift to the bottom on slightly slack line. By mixing up the action of the bait you could figure out the mood they wanted and take advantage of it.
Below are the results of scanning, marking, and using the 360 to put the bait right on the fish holding structure!