I used my spot lock on a nightstalk and it worked good. It kept the boat within an a few yards of where I started fishing. The boat also stayed facing the same direction for the 4 hours I fished. With the trolling motor kicking off and on the bait fish didn't seem to move away from the boat. I believe the spot lock will work as long as the crappie are biting deep. All the crappie were at 12' to 18' depths and the boat was setting in 38' of water. Water was also clear and right at 90 degrees.