# 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.

# series.tiledwebmap.sonification.tracks.activeWhen.crossingDown

Track is only active when `prop` was above, and is now at or below this value.

If both `crossingUp` and `crossingDown` are defined, the track is active if either condition is met.