I'm sure there's a pleasant way to put what you have to say so that it doesn't cause any bad feeling's about your hunting spot .Sure maybe he knew what he was doing ,but if you don't say anything then maybe he think's you don't mind .
I'd definately tell him to scout himself out another area so as not to interfere with your hot spot ,If he's been your friend for 25 yrs then he'll understand .

nubo