The operational requirements and procedures are determined by the type of RNP route or airspace, and will differ for:

• RNP en-route, in oceanic, or remote areas(RNP-10);

• RNP en-route, or terminal area within radio navaid coverage(RNP-5/4);

• SID/STAR, based on RNP(RNP-1);

• RNP en-route, in oceanic, or remote areas(RNP-10);

• RNP en-route, or terminal area within radio navaid coverage(RNP-5/4);

• SID/STAR, based on RNP(RNP-1);

For RNAV 10, according to “App. A Doc029 RNAV 10- RNP 10-ENROUTE”, the aircraft position can be determined by the following navigation sources:

OPERATIONAL REQUIREMENTS
9.1 Navigation performance

All aircraft must meet a lateral and longitudinal precision equal to or better than + 10 NM for 95% of the flight time in RNP 10 airspace.

9.2. Navigation equipment

All aircraft performing RNP 10 operations in oceanic and remote airspace must be equipped with two LRNS, independent and operational, made up by one INS, one IRS/FMS or one GNSS (e.g., a GPS), with such an integrity that will prevent the navigation system from providing error-inducing information.
The CAA may approve the use of a single LRNS under specific circumstances (e.g., in the North Atlantic MNPS airspace).