<!--
{
  "availability" : [
    "MapKit JS: 5.13.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "MapKitJS",
  "identifier" : "/documentation/MapKitJS/DistanceUnitSystem",
  "metadataVersion" : "0.1.0",
  "role" : "Enumeration",
  "symbol" : {
    "kind" : "Enumeration",
    "modules" : [
      "MapKit JS"
    ],
    "preciseIdentifier" : "enum/mapkit.DistanceUnitSystem"
  },
  "title" : "DistanceUnitSystem"
}
-->

# DistanceUnitSystem

Constants that indicate the system of measurement that displays on the map.

```
const DistanceUnitSystem: Readonly<{
    readonly Adaptive: "adaptive";
    readonly Metric: "metric";
    readonly Imperial: "imperial";
}>
type DistanceUnitSystem =
    (typeof DistanceUnitSystem)[keyof typeof DistanceUnitSystem];
```

## Overview

Use these constants with the map’s [`distances`](/documentation/MapKitJS/Map/distances-data.property) property.

## Topics

### Distance values

[`readonly Adaptive: "adaptive";`](/documentation/MapKitJS/DistanceUnitSystem/Adaptive)

A measurement system that adapts to the map’s language.

[`readonly Metric: "metric";`](/documentation/MapKitJS/DistanceUnitSystem/Metric)

The metric measurement system.

[`readonly Imperial: "imperial";`](/documentation/MapKitJS/DistanceUnitSystem/Imperial)

The imperial measurement system.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)