Section 7: Charts — Reading the Sectional Like a Local

SECTIONAL: 1:500,000, valid 56 days (it used to be six months - a change worth knowing when old study material disagrees), the remote pilot's chart. TAC: 1:250,000, also 56 days, existing only around Class B metros where the sectional clutters. WAC: 1:1,000,000, valid a year, cross-country manned use. Digital doctrine: SkyVector.com free and current, FAA PDFs for deeper zoom.

Relief comes as contours plus color, and the color scale is calibrated PER CHART: the Phoenix sectional runs green to maroon topping at Mt. Humphreys' 12,633 ft; Florida's tops around 720, so everything reads green. Check the corner legend, never assume.

The MEF (Maximum Elevation Figure) in each half-degree quadrant is the highest thing in it - terrain OR tower OR tree - rounded UP to the next hundred (margin rules differ for natural vs man-made; he deliberately skips the details). Format: big digit thousands, small digit hundreds - '12 over 5' reads 12,500. Phoenix example: 12,633-ft peak yields MEF 13,000; a flat Florida quadrant reads 800 courtesy of one obstacle near Okeechobee.

Colors: BLUE = operating control tower; MAGENTA = everything else. The trap he flags: untowered magenta airports can still sit inside surface Class E (E2) - color signals tower, not airspace. Shapes: hard-surface runways 1,500-8,069 ft live inside a circle ('8,069 is the scale that would fit inside of that tiny little circle'); longer runways get drawn to shape. Decorations: octagon = private (permission required), U = unverified, H = heliport, anchor = seaplane, crossed-out = abandoned, ticks = fuel, star = rotating beacon.

The data block, in reading order via Prescott: CT 125.3 (star = part-time - Class D reverts when closed), C = CTAF, ATIS 127.2, elevation 5,045, L with star = lighting with limitations, longest runway, UNICOM 122.95, then the pattern note - 'RP' listings name ONLY right-traffic runways; everything unlisted is left. Untowered blocks swap ATIS for AWOS. Everything repeats in the Chart Supplement.

The review pass, chart-side: Class B solid blue with stacked MSL pairs; C solid magenta; D blue dash-dot with bracketed ceiling; Class E's costume box - surface = dashed magenta, 700 ft = magenta shading, elsewhere-default 1,200 unlabeled, custom floors on blue zipper lines. Special use: Prohibited/Restricted/Warning share a blue comb boundary, distinguished ONLY by the P/R/W prefix; Alert areas and MOAs wear the same comb in magenta; SFRAs use a wider-spaced comb, rare.

VORs (the compass-rose symbols, tech being phased out) anchor VICTOR AIRWAYS - 'V' plus a number, drawn VOR to VOR. Classification: Class E from 1,200 AGL up to but not including 18,000 MSL, 4 NM each side of centerline. The historical residue: before Class E defaulted to 1,200 nationwide, airways needed their own designation - redundant now, still tested ('where does Class E airspace start? 1,200 feet').

The real skill is LAYERING: one point can sit on an airway AND inside Class D AND under a 700-ft E shelf - the governing floor is the most local/restrictive charted value, never automatically 1,200. One of his worked points lands in Four Peaks Wilderness, where the airspace class is irrelevant: drones banned outright. Also here: isogonic lines - dashed magenta with degree values ('11 degrees 30 minutes east') carrying the section-4 variation story onto the chart.

Symbols tier by height (<1,000 ft AGL, >=1,000, wind turbines, grouped clusters), lightning bolt = lit, UC = under construction. Each carries height MSL on top and (AGL) beneath; MSL minus AGL = the ground's own elevation. Worked: 6,792 MSL over (355) = base at 6,437. The drone application: you may climb to 400 ft above a charted obstacle's TOP - but only in Class G, tying back to 107.51's structure exception. Exam note from the worked Savannah question: when the FAA asks the obstacle's 'height,' the expected answer used the MSL figure - read the question's reference frame carefully.

VFR waypoints (flags/stars) mark where manned traffic funnels - density warnings for you. Diamonds are STADIUMS, carrying the 3 NM / 3,000 ft TFR association. Charted power lines and cables are the physical hazard layer for site surveys. Yellow shading = densely populated - the over-people caution zone. Dotted lake outlines mean intermittent water; small lake numbers are surface MSL (seaplane data). Parachute icons, aerobatic 'A' symbols, glider/ultralight letters mark activity areas. The flagged decoy: the MODE C ring around big airports is an equipment requirement for MANNED aircraft - visually near Class C, legally unrelated.

Orientation: latitude parallels the equator (0-90 N/S; his hook - 'latitude is only two letters off from altitude,' both run bottom to top); longitude runs pole to pole from Greenwich (0-180 E/W). Degrees split into 60 minutes, minutes into 60 seconds - 'think about degrees as hours.' Sectionals grid every 30 minutes with one-minute ticks between, counted by hand: his worked reads land Gainesville at 29 42'N 82 16'W and Cooperstown at 47 25'N 98 06'W.

The trap, worked verbatim: decimal coordinates convert by multiplying the fraction by 60 - 46.9 becomes 46 54'N, 98.6 becomes 98 36'W. And the FAA pairs the plot with an airspace lookup: his converted point falls in surface Class E near Jamestown Regional - authorization required. Two skills, one question.