@Zulkiers Going to be real honest with you chief...
Passive: I'm not sure you know how far meters actually are, but I'll tell you; From the top of the firing range hill to all the way to the first dummy you'll usually see is over 80 meters. That's pretty far and makes clearing out any POI a breeze as you can stand in the middle of it and see everyone in most of them, especially if the player has a 300 meter vision. However, that's more of a problem if they can see enemy players through walls, and you did say that the highlight only works within line of sight. But, its still overpowered. There are a lot of high points, and this would just make a season all about snipers, where Predator pings, and the other two shoots. That doesn't sound like a lot of fun.
Tactical: Okay, having a tactical that acts like a homing beacon for the ult isn't a bad idea. Imagine tagging someone running behind a Rampart wall or Newcastle shield, and the ult just goes around the barrier since the tagged player went behind the cover. As for the marking ability, that just sounds like a Bloodhound scan, but its only one target instead of anyone that gets scanned. I don't really see the point in it other than being a homing beacon for the ult to lock onto.
Ultimate: A form of this ultimate sounds like it would be interesting to see. My understanding of it is that it targets the marked player, or one who's in front of you, and it would bounce around a bit until it hits someone or times out. If it does hit someone, its lifetime is reduced. The only question I have is how can you mark more than one target? The tactical doesn't mention how many charges it has and with 5 seconds of the target being marked, how can another be marked and still have time to launch the ult? By the time a second player is tagged, the ult would go after the second target.