@FrostyNemesiss There are a TON of methods to spot you whenever you are.
TUGs and Motion Sensors (Recon gadgets) spot anyone in a certain radius regardless of the terrain. You can be behind 3 walls across 2 rooms and still get spotted.
3D spot from a player or a drone or even a helicopter/jet
Littlebird and some ground vehicles like MAV and LATV4 have areal spotting ability. It highlights everyone in a decently large area around the vehicle when activated.
Just a basic 3D stop is ridicilously OP. I've spotted people through grass, bushes and even some cover is there was a tini tiny part of their character was "out of cover". And even though I didn't see anything, 3D spotting did and put a large orange Dorito above them for an easy kill.
