FC5 - King's Hot Springs Hotel with Boomer, undetected with no HUD

While I've been practicing with no HUD for some weeks, I believe this is the very first time I managed to take an outpost undetected. It certainly was close, and I doubt I'd have done it without the enemies that got tagged, but I did it! I've modded the game to be harder, with more enemies in each spawn as well as more realistic guns/bullets (which was quite harder than I expected), but have recently decided to shut the HUD off for almost 100% of my gameplay. Sniping and recon have always been my Far Cry passion but I still can't manage to completely shut off the tagging process. If anybody knows how to turn tagging COMPLETELY off, please let me know in the comments. I love this engine and landscape and really am trying to make a different type of game out of it. It's epic hard at this point but I need to turn off tagging to make it so real that maybe even I can't do it. Let me know. Enjoy!