So I kinda screwed up.. I finished all the camps on the first island and I only got one "undetected" So now I'd like to get the "ninja step" perk but I have to liberate a camp undetected and every camp on the 2nd island has those big machine gun defenders that seem to be impossible to take down without being detected. Takedowns don't work on those guys correct? I can never get the prompt.
Is there any trick to beating a camp undetected if it has these guys?
I think they might have weak spots. I took one down with a single normal arrow. But if that's even true, it's just not practical. I'd do story missions until you can get that heavy takedown skill. It seems once you take too many bases, they start throwing the heavy into all of them.
So, to experiment, I'd not take EVERY base. Skip over some. If you have two that are too close where fast travel is not extremely necessary, just take one base and leave the other alone. Another bonus to this is you'll keep enemies in the game world to fight when you need to go for stuff like the 50 flamethrower kills or the "kill 4 with one explosive" achievements.
I could be wrong though. Once you have to go to Badtown, it might just trigger those heavies to spawn anyway, that it might not even relate to how many bases you captured.