# Bias By Geolocation

Bias search to a geospatial circle determined by an origin and radius in meters. Max radius is `50000`.

Uses the format `bias_lonlat=[longitude],[latitude],[radius in metres]`. Only one geospatial bias may be provided

In the example below, a geolocation bias is set to prioritize addresses near "10 Downing St".

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```
<form style="max-width: 450px; padding: 10px;">
  <label for="line_1">Address First Line</label>
  <input type="text" id="line_1" />
  <label for="line_2">Address Second Line</label>
  <input type="text" id="line_2" />
  <label for="line_3">Address Third Line</label>
  <input type="text" id="line_3" />
  <label for="post_town">Town or City</label>
  <input type="text" id="post_town" />
  <label for="postcode">Postcode</label>
  <input type="text" id="postcode" />
</form>
```

```

import { AddressFinder } from "@ideal-postcodes/address-finder";

AddressFinder.setup({
  apiKey: "ak_test",
  queryOptions: {
    // Set geolocation bias to 10 Downing St
    bias_lonlat: "-0.1276,51.5034,100",
  },
  outputFields: {
    line_1: "#line_1",
    line_2: "#line_2",
    line_3: "#line_3",
    post_town: "#post_town",
    postcode: "#postcode",
  },
});
```