how they find you:
If you move you are not 100% invisible and easy to see and get “spotted”
If you run or walk not crouched then you make loud stomps and they can hear that a long way.
if you move in trees the trees creek and make a noise and branches move giving away your position.
If you move through bushes and foliage on the ground they can see the bushes move and know where you are.
If you leap they can see you even when cloaked and when you land a lot of dust comes where you land.
if you change vision to thermal and back your eyes glow yellow for a second and they can see that.
If you use a weapon that is ranged like plasma or bow or disk etc it has a trail that shows where it came from.
if you you make any clicking or any sounds they can hear that.
if you are hurt and lost even a small amount of health, then bright green blood pisses out of your ass and they can see that miles away…
If any AI are close they can see you and shoot you and if the fireteam see that they will know you are there because the AI is shooting you.
If you use any items or heal or do anything then it usually makes a noise of some kind
Basically, Its super easy to find the predator and cloaking isnt very useful against a good team.