/**
 * Type of navigational aid as classified by the FAA.
 */
export type NavaidType = 'VOR' | 'VORTAC' | 'VOR/DME' | 'TACAN' | 'DME' | 'NDB' | 'NDB/DME' | 'FAN_MARKER' | 'MARINE_NDB' | 'VOT';
/**
 * The full set of {@link NavaidType} values, in declaration order.
 *
 * Use as the single source of truth for value-side iteration (e.g. building a
 * lookup table keyed by navaid type) or with {@link isNavaidType} to narrow
 * an external string into the union. The `as const satisfies` brand keeps
 * this array in sync with the type at compile time.
 */
export declare const NAVAID_TYPES: readonly ["VOR", "VORTAC", "VOR/DME", "TACAN", "DME", "NDB", "NDB/DME", "FAN_MARKER", "MARINE_NDB", "VOT"];
/**
 * Type guard that narrows a string to {@link NavaidType} when it matches a
 * member of {@link NAVAID_TYPES}.
 *
 * Useful when consuming external strings (URL params, config files, MCP tool
 * inputs) that should be validated before being used as a navaid type.
 *
 * @param value - The string to test.
 * @returns `true` if `value` is a valid `NavaidType`.
 */
export declare function isNavaidType(value: string): value is NavaidType;
/**
 * Maps FAA NAV_TYPE values from NASR data to NavaidType.
 */
export declare const NAVAID_TYPE_MAP: Record<string, NavaidType>;
/**
 * Operational status of a navaid facility.
 */
export type NavaidStatus = 'OPERATIONAL_IFR' | 'OPERATIONAL_RESTRICTED' | 'OPERATIONAL_VFR' | 'SHUTDOWN';
/**
 * Maps FAA NAV_STATUS values from NASR data to NavaidStatus.
 */
export declare const NAVAID_STATUS_MAP: Record<string, NavaidStatus>;
/**
 * A navigational aid (navaid) facility such as a VOR, VORTAC, NDB, or TACAN.
 * Provides radio-based position and course guidance for aircraft navigation.
 */
export interface Navaid {
    /** Navaid identifier (e.g. "BOS", "JFK", "ABR"). */
    identifier: string;
    /** Official facility name (e.g. "BOSTON", "KENNEDY", "ABERDEEN"). */
    name: string;
    /** Type of navigational aid. */
    type: NavaidType;
    /** Operational status of the navaid. */
    status: NavaidStatus;
    /** Latitude in decimal degrees, positive north. */
    lat: number;
    /** Longitude in decimal degrees, positive east. */
    lon: number;
    /** Two-letter state code (e.g. "NY", "CA"). Absent for non-US navaids. */
    state?: string;
    /** Two-letter country code (e.g. "US"). */
    country: string;
    /** Associated city name. */
    city?: string;
    /** Field elevation in feet MSL. */
    elevationFt?: number;
    /** VOR/VORTAC/VOR-DME/TACAN/DME/VOT frequency in MHz (108.0-117.95). */
    frequencyMhz?: number;
    /** NDB/NDB-DME/MARINE NDB frequency in kHz (190-535). */
    frequencyKhz?: number;
    /** TACAN/DME channel designation (e.g. "84X", "77X"). */
    tacanChannel?: string;
    /** Magnetic variation in degrees (absolute value). */
    magneticVariationDeg?: number;
    /** Magnetic variation direction ("E" or "W"). */
    magneticVariationDirection?: string;
    /** Year the magnetic variation was last determined. */
    magneticVariationYear?: number;
    /** Low-altitude ARTCC identifier (e.g. "ZNY", "ZBW"). */
    lowArtccId?: string;
    /** High-altitude ARTCC identifier (e.g. "ZNY", "ZBW"). */
    highArtccId?: string;
    /** Navaid service volume class code (e.g. "VL", "VH", "H", "L", "T"). */
    navaidClass?: string;
    /** DME service volume class code (e.g. "DH", "DL"). */
    dmeServiceVolume?: string;
    /** Transmitter power output in watts. */
    powerOutputWatts?: number;
    /** Whether simultaneous voice transmission is available on the frequency. */
    simultaneousVoice?: boolean;
    /** NDB classification code (e.g. "HH", "H", "MH", "MHW", "HW", "LOM", "LMM"). */
    ndbClass?: string;
    /** Whether the navaid is available for public use. */
    publicUse?: boolean;
    /** Scheduled operating hours (e.g. "24", "SS-SR"). */
    operatingHours?: string;
    /** NOTAM facility identifier. */
    notamId?: string;
    /** Fan marker identifier (for FAN_MARKER type only). */
    markerIdentifier?: string;
    /** Fan marker shape (for FAN_MARKER type only). */
    markerShape?: string;
    /** Fan marker bearing in degrees (for FAN_MARKER type only). */
    markerBearingDeg?: number;
    /** DME/TACAN latitude in decimal degrees, if different from the navaid position. */
    dmeLat?: number;
    /** DME/TACAN longitude in decimal degrees, if different from the navaid position. */
    dmeLon?: number;
}
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