Starting with M — Page 573, Lesson 574

This is the index of the book — the alphabetical list of topics and the page numbers where each one appears. So we're looking at the entries under the letters M, N, O, P, and the start of Q. Let me walk you through what's here, because the index itself is a study tool. It tells you where every concept lives in the book, and it gives you a preview of the terminology you'll be expected to know. Starting with M. We have Minimum Safe Altitude, abbreviated MSA, on page 221. That's the lowest altitude you may fly in a given area while still maintaining terrain clearance — we'll cover it properly when we get there. Then Minute of Latitude, page 30. One minute of latitude is the basis of the nautical mile, so these two entries are linked. Then Multi-drift Winds, page 169 — that's a technique for allowing for wind when the wind itself is changing along your route. Moving to N. Nautical Mile, page 30 — the standard unit of distance in navigation, defined by the minute of latitude. Nautical Twilight, page 425 — that's the period when the sun is between 6 and 12 degrees below the horizon, relevant for night flying rules. Navigation Techniques, page 227 — the general methods of navigating. New Track Reference, page 205 — that's the technique of re-establishing a track after you've been blown off course. North Celestial Pole, NCP, page 384 — that's the point in the sky directly above the Earth's north pole, used in astro navigation. And Nouvelle Triangulation de France, NTF, page 3 — that's the French national survey datum, a reference system for coordinates. Now O. Oblate Spheroid, page 3 — that's the actual shape of the Earth, flattened at the poles. One Sixth Rule, page 341 — that's a rule of thumb for correcting track error, we'll get to it. Orthomorphism, pages 288 and 297 — that's the property of a map projection that preserves angles and shapes locally. And OS36, page 3 — that's the Ordnance Survey of Great Britain 1936 datum, another coordinate reference system. Then P. Parallel of Origin, pages 341 and 344 — that's the parallel of latitude chosen as the reference for a projection. Parallel of Tangency, page 341 — the parallel where the projection surface touches the globe. Parallels of Latitude, page 8 — the east-west lines on the Earth's surface. Perihelion, page 380 — the point in Earth's orbit where it's closest to the sun. Planned Track, page 199 — the intended path over the ground. Polar Diameter, page 3 — the Earth's diameter measured through the poles, shorter than the equatorial diameter because the Earth is an oblate spheroid. Polar Grids, page 465 — a grid system used for navigation in polar regions. Polar Stereographic Graticule, page 365 — the grid of meridians and parallels on a polar stereographic projection. Polar Stereographic Projection, page 365 — the map projection used for polar charts. Port, page 125 — the left side of the aircraft when facing forward. Position Line, page 477 — a line on which the aircraft is known to be located. Position Reference Systems, page 7 — the systems used to define position. Practice Flight Plan, page 151 — a worked example flight plan. Pressure Altitude, page 88 — altitude indicated when the altimeter is set to the standard pressure of 1013.25 hectopascals. And Pressure (or Position) Error, page 105 — the error in the airspeed indicator caused by the position of the static vent. Then we start Q, but the excerpt cuts off there. So this is the index — it's your map of the whole book. Every one of these terms is something you'll need to know precisely, and the page numbers tell you exactly where to find each one.