.  
Design of the procedure in accordance with PANS-OPS design criteria stipulations of the PANS-OPS Design Criteria used; and

.  
the aircraft’s onboard RNAV system being certified (or the navigation function included in a flight management system (FMS)) being certified to the RNAV standard required by the Terminal area procedure and/or SID/STAR (and the flight crew having the appropriate operational approval);

PANS-OPS  CERTIFICATION 
DESIGN CRITERIA  STANDARD OF AIRCRAFT 
RNAV SYSTEM 

In ECAC, two RNAV standards exist:
.  
Basic RNAV (B-RNAV) which was introduced into the upper airspace of ECAC in 1998; and

.  
Precision RNAV (P-RNAV) for use in Terminal Airspace.

Note: With effect from ± 2010, RNP RNAV is likely to be the applied in Terminal Airspace.
For both B-RNAV and P-RNAV, this coherency referred to previously between the navigation infrastructure, PANS-OPS design criteria and the certification standard of the aircraft’s RNAV system is required. Thus different obstacle clearance criteria (PANS-OPS) apply for B-RNAV compared to P-RNAV, different certification standards exist for B-RNAV and P-RNAV, and the navigation sensors (which relate to the navigation infrastructure) that can be used for B-RNAV and P-RNAV are not necessarily the same (though similar.
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The main differences between any RNAV type and another concerns:
.  RNAV Systems Description
(E.g. a database needed; positioning sensors to be used etc)
.  
Airworthiness Certification Objectives:
Described in terms of accuracy, Integrity & Continuity of service

. 
 Functional Criteria:
(Required; Recommended)

.  
(Area of application: where it can be used…and how)

The differences for RNAV System Descriptions are identified in the following table:
B-RNAV  P-RNAV  RNP (x) RNAV* 
Accuracy  5 NM Lateral  1 NM Lateral  (x) NM Lateral and Longitudinal 
Integrity  Low  Medium  High 
Continuity of Function  - Loss = Remote  Loss = Extremely Remote 

* According to MASPS DO236-B
The increasing level of sophistication of the RNAV System (B-RNAV < P-RNAV < RNP(x) RNAV) results in a proportional increase on the Requirements for respectively the RNAV Systems, Accuracy/Integrity/Continuity and Required Functionalities.
The main differences in what is required and what is recommended for Functional Criteria between any RNAV type and another are identified in the following table:
B-RNAV  P-RNAV  RNP (x) RNAV* 
Required  4 Way point storage (manual data entry; Display of distance/bearing to Way-point)  NAV Data Base; Data Integrity; leg types (e.g. TF; CF; FA)  NAV Data Base; Integrity (RNP alerting); leg types (e.g. RF; FRT)// Off-set 
Recommended  // Off-set 

* According to MASPS DO236-B
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Where and how different RNAV types can be used i.e. the Area of Application is described in the following tables:
B-RNAV  P-RNAV  RNP* (x) RNAV 
　
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