Identifying illegal back row attacks

[DaveASA/FED]

Not sure i am a vet....but I have two things I do.

1) I find a "key" player to remember either a hard hitter or the setter then you get a feel for who is to their right and left and you can know where they are on the court.

2) I use the wheel as a line up tool and glancing down I can get back row players in my head quick

So something like this goes through my head, ok 7 is back left I got 7,10,18 as back row....then on the other side 8 is front row so 9, 1 and 12 are my back row......so if they do anything wrong I got them!