2013 Release: User Guide of GMap Editor V2
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Enable Markers Clustering in Map Settings to create data mining maps.

A data clustering live map sample - Custom Google Map

Edit Settings for Markers Clustering
| Grid Size |
50 by default squares of a certain size divided for clustering in the map and then grouping the markers into each grid square. |
| Max Zoom |
12 by default The max zoom level for the clusterer. |