Ybbn rnav rnp ar
According to ybbn rnp ar approach ,there are rnav-m,rnav-p and rnav-u(rnp) approaches .I would like to know what m,u and p are.
Normally when there are more than one app,these are identified by z y or x and when more than one circling ,these are identified by a b or c.
I am not sure about these letters.(no reference) ,please help me .