To download a shapefile of any of the base data layers in the map, click on the disk icon next to the layer name in the legend:

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To pan around the map, you can click and drag your mouse in the direction you want to pan. To zoom in on the map, double click on the area you want to zoom into, or, if you have a mouse wheel, you can use that to zoom in or out. Or use the Zoom In/Out control in the upper left corner of the map:

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To explore layer information, click the Information Tool in the upper left corner and click on features in the map:

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To turn layers on and off, click the checkbox next to the layer name in the Legend:

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To change the basemap from topographic to a satellite image, click the Basemap Toggle in the upper right corner: