the ghost, at least all the ones I personally know of, do not move, well for sure not enough to notice. Several Ultrex owners have told me in low wind or no wind conditions they move, for sure enough it is noticeable. I have used the ghost from as shallow as 3' of water for locking onto a spot and the boat may swing depending on wind, current or wakes from other boats, but the trolling motor stays in one spot, I would say within inches. My ghost has been great for locking onto a spot in no wind to 25 mph wind and gusting. Actually better than my 50 lb anchor, because in high winds you need to let out extra rope to hold and the whole boat will swing a little depending on how much rope has to be let out to hold. The ghost does not move, it stays in one spot.
Well, it did move one time. I wanted to show a friend how great the spot lock was. He was on one of the docks at 4 corners. I was within feet of the dock. I hit the lock button and the trolling motor started "searching". Slow speed but just moved and quickly was bumping the front of the boat into the dock, just lightly. I was like, well the ghost died or lost settings. Nope, called Lowrance, he said most satellites orbit close to the equator, he said something to that effect. So if trolling motor is trying to lock next to a boat dock and there are other docks blocking the direction toward equator then lock option does not work well or at all. Believe he is right, so long I have (I am guessing 50' from the dock) spot lock works great.