Plain English Meaning
A rulebook for flying across the North Atlantic and similar oceanic regions. To use that airspace, your aircraft has to navigate accurately enough to stay in its assigned slot, and you need approval to be there.
Full Definition
A set of navigation accuracy standards that an aircraft and its crew must meet to operate within designated oceanic airspace, most notably the North Atlantic. Aircraft must demonstrate a specified level of lateral and vertical navigation precision, carry approved long-range navigation equipment, and the crew must hold the appropriate authorization before flying in MNPS airspace.
Context Anchor
Seen when planning or discussing -, oceanic, or - that require navigation approval.