Crappie are notorious for suspending in summer time, often in open water. I use my fish finder looking for two things baitfish and the depth of fish. Often you'll find most fish at a specific depth. I then start plowing water looking for what color works best. While Crappie seem to more often be along a creek or river channel, their depth may be very shallow. Crappie always move up to take a bait, never down. If you're a foot deeper than the fish, they will never see your bait. When you make a turn spider rigging always watch for two things. Outside rods will move faster and shallower while inside will slow down and drop deeper. If you pick up fish on a turn it may give an indication of needing to change your speed or bait depth. I also always tip my jigs with Crappie Nibbles. Sometimes that little bit of scent makes all the difference.