The map shown by a Map field can automatically center and zoom in on the data shown on the map. This behavior is determined by two factors:

• The AutoCenter and AutoZoom properties' values specified for the whole Map field, together with several related properties fine-tuning the automatic centering and zooming (AutoZoomPadLon, AutoZoomPadLat, MaxAutoZoom, RoundAutoZoom).
• The spatial data represented by the layers, provided that data is "tracked". Tracking (such as whether or not a particular piece of spatial data should be used for automatic centering and zooming) is determined by the layer's Track property. Additionally, for KML layers an expression may be specified which will determine whether a specific KML item should be tracked or not.