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**Sectional chart legend.** Every sectional chart has a legend that decodes the symbology: airport markers, airspace boundaries (blue / magenta, solid / dashed), obstructions, communication frequencies, topographic relief, miscellaneous. - **On the exam** — know the four airspace-boundary conventions: **solid blue = Class B**, **solid magenta = Class C**, **dashed blue = Class D**, **dashed magenta = Class E surface area**.

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