Refer to figure.
You must learn this table! It appears in many questions.

The North Atlantic High Level Airspace (NAT HLA) is oceanic airspace and so does not need such accurate flying as an approach would, so it can allow the less stringent navigation requirements.

(In case anyone is interested in the background as to why RNP10 is in brackets, the ICAO PBN Manual explains; "This chapter addresses the implementation of RNP 10 to support 50 NM lateral and the 50 NM longitudinal distancebased separation minima in oceanic or remote area airspace. This guidance has been titled RNAV 10 for consistency with the other chapters in this manual. This designation and version of the material do not change any requirements, and do not affect operators who obtained an RNP 10 authorization from their relevant State regulatory authority. RNAV 10 does not require on-board performance monitoring and alerting. However, the designation of the airworthiness and operational approval as well as airspace/route designation remains “RNP 10” in order to “grandfather” the present publications and extensive approvals. Recognizing the extent of existing airspace designations and operational approvals under RNP 10 designation, it is anticipated that any new airspace designations and aircraft approvals will continue to use the “RNP 10” term while the required PBN application will now be known as “RNAV 10.”)