# Welcome to the Highcharts Gantt JS (gantt) Options Reference

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

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# navigator.yAxis.type

The type of axis. Can be one of `linear`, `logarithmic`, `datetime`, `category` or `treegrid`. Defaults to `treegrid` for Gantt charts, `linear` for other chart types.

In a datetime axis, the numbers are given in milliseconds, and tick marks are placed on appropriate values, like full hours or days. In a category or treegrid axis, the point names of the chart's series are used for categories, if a categories array is not defined.