Scanning tunnelling microscope - Whats the piezoscanner for?

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What does the piezoelectric scanner do? Does it record the electric current tunnelled by the tip or is it just used to move the tip in response to electric currents?
 
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The latter. It is to move the atomically-sharp tip across the sample view, which is on the order of hundreds of square nanometers (in a fine-scan scheme).
 

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