Touch and drag on the device screen to pan the map.

Touch and pinch apart on the device screen to zoom-in on the map.

Alternately, use the zoom-in button in the navigation tools.
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Touch and pinch together on the device screen to zoom-out on the map.

Alternately, use the zoom-out button in the navigation tools.
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Use the Full Extent button to return to the full extent of the map.