By now means do I call myself a crappie fisherman but I do fish for them some in the late winter.
What I do is go to river bends or the confluence of 2 streams and slowly cover the area with the boat looking for large schools of shad. Everytime I find one I mark it on a gps.
When I have covered the area to my satisfaction, I drop the trolling motor and fish from one waypoint to the other casting a jig or swimming minnow. The depth of the water and wind determine the weight of the jig head.
As the bait falls I keep tension on the line hoping for a suspended bite. If I get none, I hop the thing off the bottom back to the boat and repeat the process. When I catch a fish, I mark it on the gps, stop the boat and fan cast the area either catching more or deciding it was a fluke.
Also, it never hurts to count the bait down so they you can repeat suspended bites if there is a school in the area. But like I said I don't consider myself to be a crappie fisherman.
Other than that I vertical jig fish to 70 fow but that is a whole other topic.