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We consider a high density network of low power, stationary sensor nodes (motes) with an overlay of fewer, higher power mobiles that respond to events sensed by the motes. The motes sense the event(s) in progress and guide the much fewer, more expensive, mobiles to move to locations which provide best coverage of the event. The mobiles use the distributed Lloyd algorithm to optimally distribute the entire set of mobiles across the event area. In the distributed Lloyd algorithm, mobiles communicate only with their neighbor mobiles and do not have available the locations of the remaining mobiles. We study the effect of constraining the distance within which the motes can communicate with the mobiles. Then, we suggest an energy-efficient model for communication between the mobiles and the motes. We also investigate the effect of varying the mote density on the coverage provided by the mobiles.