Some questions. Is the property you are hunting private and are you the only person hunting there? The times you do spot this deer in the off season is he always in the same general area? Is he feeding when you see him during the day in the off season?, or have you just spotted him crossing a field, road or in the woods while he is traveling from a feeding to bedding area or while you are scouting in the off season ect,?. Do you increase your presence in the woods just prior to hunting season (example hanging stands, final trimming, scouting,) giving him the trigger to go nocturnal?, expecially in the area you know him to frequent. If you are not the only person hunting the property are others doing these things. If not I would try to start with some long range scouting using a spotting scope or binocs from as far as you can without entering the areas he frequents and from a location that gives you the best vantage to cover as much ground as possible. I would start while the bucks are in thier summer pattern, while they are feeding as much as they can to obtain the nutrition for optimum antler growth. I dont know when your season begins but if it's early like mid Sept like some of the States you may be able to observe a location where this buck may enter a feeding area from the same basic location on a regular basis without the buck ever being able to detect you presence. If you can locate an area like this I would try and sneak in during the middle part of the day and hang a stand using all the scent control I would use during the regular season. I would hang it on the edge of the woods where I saw the deer exit and would not venture into the woods. I also would make the stand selection one that could be hung quickly and quietly( I like the Lone Wolf Sticks and Hang on. None easier). Speaking of hang on, Hang onto your wallet when you hear the price. Pick a tree in advance while doing your long range scouting and dont go in there and do alot of trimming. If you can pattern him this way it's almost a one time maybe two time shot and then forget it. Thats what I would try.