# Georeferencing Maps

The MultiSet Visual Positioning System (VPS) now supports the use of geolocation data as an external prior to enhance localization performance. This feature, called **GeoHint**, allows you to provide approximate GPS readings to the localization query, which helps narrow down the search space and improves the speed and accuracy of pose estimation.

By geo-referencing your 3D scans with WGS84 coordinates, you can leverage device GPS and other sensors to provide initial position estimates that significantly reduce the computational load during localization.

<figure><img src="https://3163433004-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FokTDI7QVY04Zvb1pQ8Ry%2Fuploads%2FePEED3kMJXbuDQ2N5s8W%2FChatGPT%20Image%20Jul%2014%2C%202025%2C%2009_56_41%20AM.png?alt=media&#x26;token=50e19982-179d-4cae-8e71-236fd90cd542" alt="" width="375"><figcaption></figcaption></figure>

### Benefits of Using HintPosition

* **Improved Performance**: Reduces search space and computational requirements
* **Faster Localization**: Achieves quicker initial positioning by focusing on relevant areas
* **Higher Accuracy**: Resolves potential ambiguities in visually similar environments
* **Seamless Transitions**: Enables smooth transitions between different mapped areas
* **Reduced Resource Usage**: Lower memory and processing requirements on devices

### Setting Up Geo-Referenced Maps

To use the GeoHint field in Localization API's effectively, you need to establish a proper geo-reference for your MultiSet maps. This involves:

1. Recording the exact WGS84 coordinates (latitude, longitude, altitude) of your map's origin point
2. Documenting the compass heading to establish the orientation relative to true north
3. Configuring these values in your MultiSet Developer Portal

<figure><img src="https://3163433004-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FokTDI7QVY04Zvb1pQ8Ry%2Fuploads%2FEICZeQSYSgntOEHSumCt%2FScreenshot%202025-12-06%20at%202.29.36%E2%80%AFPM.png?alt=media&#x26;token=eae51987-57cf-466f-9b59-273d4da30120" alt="" width="563"><figcaption></figcaption></figure>

{% hint style="success" %}
To achieve accurate conversions at the centimetre level, ensure that you enter at least 6 decimal places for latitude and longitude.
{% endhint %}

<figure><img src="https://3163433004-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FokTDI7QVY04Zvb1pQ8Ry%2Fuploads%2F4iSa4Ogo1zVJYMuiKbY6%2FScreenshot%202025-07-10%20at%206.47.46%E2%80%AFPM.png?alt=media&#x26;token=5a0b6cc9-7f82-41e0-8440-a029355e7151" alt="" width="375"><figcaption></figcaption></figure>


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