The "R" is for Radial. Your course can be dialed into 056 or 236, but your POSITION had better be on the 056 degree radial from the VOR. I have'nt referenced the plate your refering to, so I don't know if you are heading to or from the VOR, but if you're going to(while on the 056R)you should have 236 set on the OBS, if going away 056. This will give you proper sensing (as opposed to reverse). The "D" is for DME distance. The syntax is a little different than what I'm used to in the States, but I read the DME portion as saying; At 12DME from MCT-VOR you should be at or above 4000' and at 14DME from MCT, you need to make a right turn to intercept the WAL-VOR 084 degree radial. And again, if this is INBOUND to WAL, your course should be set to 264, or if this radial is joined, to be tracked AWAY from the station.......084. 8)