Refer to figure.
NORTH ATLANTIC MNPSA OPERATIONS MANUAL
MINIMUM NAVIGATION PERFORMANCE SPECIFICATION AIRSPACE
The vertical dimension of MNPS Airspace is between FL285 and FL420 (i.e. in terms of normally used cruising levels, from FL290 to FL410 inclusive).
The lateral dimensions include the following Control Areas (CTAs):
SHANWICK, GANDER and SANTA MARIA OCEANIC
NEW YORK OCEANIC North of 27°N but excluding the area west of 60°W and south of 38°30'N
SHANNON-GANDER is within MNPS Airspace. An aircraft with no MNPS certification must fly below FL285 (not allowed to fly in MNPS airspace) => at FL 280 or below.
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