capt.topgun
If you are B-RNAV approved (RNP-5) you can fly published RNAV departures.
If you P-RNAV approved (RNP-1), you can fly published P-RNAV departures.
BRNAV departures either use a Navaid or RWY track to climb you above MSA, from where you can navigate using B-RNAV without having to monitor track accuracy with raw data. P-RNAV departures have no such requirements below MSA.
Typically, RNAV SIDS will be overlays of existing conventional SIDs.
Good idea to check with your company before you use them though!
P