# Welcome to the Highcharts Maps JS (highmaps) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# plotOptions.geoheatmap.sonification.defaultSpeechOptions.mapping.volume.value

A fixed value to use for the prop when mapping.

For example, if mapping to `y`, setting value to `4` will map as if all points had a y value of 4.