Figure 1-32. Operation requirements for RNAV.  •  Combination of minimum and maximum – 7000  4600  Pilot Responsibility for Use of RNAV Departures  environment. You must understand the type of navigation  system installed in your aircraft, and furthermore, you  must know how your system operates to ensure that  you can comply with all RNAV requirements. Operational  information should be included in your AFM or its  supplements. Additional information concerning how  to use your equipment to its fullest capacity, including  “how to” training, may be gathered from your avionics  manufacturer. If you are in doubt about the operation of  your avionics system and its ability to comply with RNAV  requirements, contact the FAA directly through your local  Flight Standards District Office (FSDO). RNAV departure  procedures are being developed at a rapid pace to provide  RNAV capabilities at all airports. With every chart revision  cycle, new RNAV departures are being added for small  and large airports. These departures are flown in the same  manner as traditional navigation-based departures; pilots  are provided headings, altitudes, navigation waypoint,  and departure descriptions. RNAV SIDs are found in the  TPP with traditional departure procedures.  Some SIDs may still have “(ATC)” adjacent to a crossing  altitude as shown in Figure 1-33 which implies that the  crossing altitude is there to support an ATC requirement.  A new charting standard has begun a process to remove,  over a period of time, the ATC annotation. The Cowboy  Four Departure (RNAV) shown in Figure 1-34 depicts the  new charting standard without ATC annotations. When  necessary, ATC may amend or delete SID crossing altitude  restrictions; when doing so, ATC assumes responsibility  for obstacle clearance until the aircraft is re-established  laterally and vertically on the published SID route.  RNAV usage brings with it multitudes of complications  as it is being implemented. It takes time to transition,  to disseminate information, and to educate current  and potential users. As a current pilot using the NAS,  you need to have a clear understanding of the aircraft  equipment requirements for operating in a given RNP  1-37  NOT FOR NAVIGATION Aircraft system operation requirements 