Pure logic library for querying US navaid data. Look up navaids by identifier, frequency, geographic proximity, type, or fuzzy text search. Contains no bundled data - accepts an array of Navaid records at initialization. For zero-config use, pair with @squawk/navaid-data.

Part of the @squawk aviation library suite. See all packages on npm.

Usage

import { usBundledNavaids } from '@squawk/navaid-data';
import { createNavaidResolver } from '@squawk/navaids';

const resolver = createNavaidResolver({ data: usBundledNavaids.records });

// Look up by identifier
const bos = resolver.byIdent('BOS');

// Find by frequency (MHz for VOR-family, kHz for NDB-family)
const onFreq = resolver.byFrequency({ frequency: 113.7 });

// Find nearest navaids to a position
const nearby = resolver.nearest({ lat: 42.3656, lon: -71.0096 });
for (const result of nearby) {
  console.log(result.navaid.name, result.distanceNm, 'nm');
}

// Get all navaids of a type
const vors = resolver.byType(new Set(['VOR', 'VORTAC', 'VOR/DME']));

// Fuzzy-search across identifier and name (scored, best match first)
const results = resolver.search({ text: 'boston' });
console.log(results[0]?.navaid.name, results[0]?.score);

Consumers who have their own navaid data can use this package standalone:

import { createNavaidResolver } from '@squawk/navaids';

const resolver = createNavaidResolver({ data: myNavaids });

Browser / SPA usage

The resolver factory has no Node-specific imports and ships an explicit /browser subpath for SPAs and edge runtimes. Pair it with @squawk/navaid-data/browser:

import { loadUsBundledNavaids } from '@squawk/navaid-data/browser';
import { createNavaidResolver } from '@squawk/navaids/browser';

const dataset = await loadUsBundledNavaids();
const resolver = createNavaidResolver({ data: dataset.records });

The /browser entry is identical to the main entry; the separate subpath exists so browser support is an explicit, publint-verified part of the public API surface.

API

createNavaidResolver(options)

Creates a resolver object from an array of Navaid records.

Parameters:

• options.data - an array of Navaid objects (from @squawk/types)

Returns: NavaidResolver - an object with the lookup methods described below.

resolver.byIdent(ident)

Looks up navaids by identifier (e.g. "BOS", "JFK"). Multiple navaids can share the same identifier (e.g. an NDB and a VOR at different locations). Case-insensitive. Returns Navaid[].

resolver.byIdentAtPosition(ident, lat, lon, toleranceNm?)

Looks up the single navaid sharing the given identifier that lies nearest to a geographic position. Multiple navaids can publish the same identifier (a co-located NDB and VOR/DME, or two distant stations reusing a code); this disambiguates them by proximity to a known point such as a map-click location or an adjacent route waypoint.

| Parameter | Type | Description | | ------------- | ------ | ------------------------------------------------------------------------------------------------------- | | ident | string | Navaid identifier (case-insensitive) | | lat | number | Latitude of the reference position in decimal degrees (WGS84) | | lon | number | Longitude of the reference position in decimal degrees (WGS84) | | toleranceNm | number | Optional. Maximum great-circle distance in nautical miles. Omit to let the nearest match win regardless |

Returns the nearest matching Navaid by great-circle distance, or undefined when no navaid carries the identifier or none fall within toleranceNm.

// Disambiguate a shared identifier against a map-click position
const navaid = resolver.byIdentAtPosition('AA', 47.45, -122.31);

resolver.byFrequency(query)

Finds navaids operating on a given frequency. For VOR-family navaids the frequency is in MHz; for NDB-family navaids it is in kHz.

| Property | Type | Description | | ----------- | ------------------------ | ----------------------------------------------------------------- | | frequency | number | Frequency value to match (MHz for VOR-family, kHz for NDB-family) | | types | ReadonlySet<NavaidType> | Optional. When provided, only navaids of these types are returned | | limit | number | Optional. Maximum number of results. Defaults to 20 |

Returns Navaid[], sorted alphabetically by identifier.

resolver.nearest(query)

Finds navaids nearest to a geographic position, sorted by distance ascending.

| Property | Type | Description | | --------------- | ------------------------ | ----------------------------------------------------------------- | | lat | number | Latitude in decimal degrees (WGS84) | | lon | number | Longitude in decimal degrees (WGS84) | | maxDistanceNm | number | Optional. Maximum distance in nautical miles. Defaults to 30 | | limit | number | Optional. Maximum number of results. Defaults to 10 | | types | ReadonlySet<NavaidType> | Optional. When provided, only navaids of these types are returned |

Returns NearestNavaidResult[], each containing:

• navaid - the matched Navaid record
• distanceNm - great-circle distance in nautical miles (rounded to 2 decimal places)

// Find the 5 nearest VORTACs within 50 nm
const nearby = resolver.nearest({
  lat: 42.3656,
  lon: -71.0096,
  maxDistanceNm: 50,
  limit: 5,
  types: new Set(['VORTAC']),
});

resolver.byType(types)

Returns all navaids matching the given type(s), sorted alphabetically by identifier.

const ndbs = resolver.byType(new Set(['NDB', 'NDB/DME']));

resolver.search(query)

Fuzzy-searches navaids across identifier and name. Matching is case-insensitive and tolerant of prefixes, substrings, subsequences, and small typos. Results are scored and returned best-match first.

| Property | Type | Description | | ---------- | ------------------------ | ---------------------------------------------------------------------------------------- | | text | string | Search text, matched fuzzily against each navaid's identifier and name | | limit | number | Optional. Maximum number of results. Defaults to 20 | | types | ReadonlySet<NavaidType> | Optional. When provided, only navaids of these types are returned | | minScore | number | Optional. Minimum match score (exclusive) in [0, 1] a result must reach. Defaults to 0 |

Returns NavaidSearchResult[], sorted by descending score, each containing:

• navaid - the matched Navaid record
• score - match strength in [0, 1], where 1 is an exact identifier or name match
• matchedField - which field produced the best match: 'identifier' or 'name'
• ranges - matched character ranges within the best-matching field's text, for highlighting

const results = resolver.search({ text: 'boston', limit: 10 });
for (const { navaid, score, matchedField } of results) {
  console.log(navaid.identifier, score, `(matched ${matchedField})`);
}