Really?? I think too much emphasis is put on spot lock. Honestly there is no technology that can hold a 1,000-2,000# boat exactly on a spot in winds of 10-20 mph. It just hasn't been accomplished yet. GPS position, reaction time,etc. is going to cause drift. I have a Terrova that had no problem holding me on deep brush piles. Yes it did drift on high wind days but with that being said I could still fish by watching my screen & adjusting cast angles. It never moved over 8' off my spots. I caught fish during that time. Maybe not as many as on a light breeze day but my gosh unless you're vertical fishing straight down on a spot only 3' in diameter that you can catch fish in I don't know what to tell people. Most of my brush piles are at least 6' in diameter or more. Buy what you desire based on more features than just one. I think you'll be happy with all the other features combined. Try to find someone with the ones you're interested in & go with them to see the units work. Good luck & tight lines
'98 Tr20 Triton completly updated & rigged, 05 Magnum c-channeltrailer
'94 Merc 200Xri completly rebuilt & noseconed/low water pickup lower unit.
92' ChampioN 201DCR Elite repower in progress.