as u know u can't track GMs
but i found out a method to check if there is a GM on this map or not
Therefor u just need transform pots.
If there is a GM on the map also he uses the invisibility skill, u can transform him/her.
u got messag: You transformed GMNeru or something like that.
I have just tried this and it works.
Yeah i know its not something special i just wanna show u this.