Nokia’s acquisition spree shows no sign of slowing down following news that its digital maps business Navteq has acquired location-based mobile advertising firm Acuity Mobile for an undisclosed sum. “The acquisition of Acuity underscores Navteq’s commitment to and investment in location-based advertising technology,” noted a statement. US-based Acuity has a headcount of 18. In February last year Navteq announced it had made an undisclosed equity investment in Acuity.

Top mobile device manufacturer Nokia brought Navteq last year for US$8.1 billion. It has acquired many other smaller firms in the past 18 months to jump start its Internet services business as growth in the mobile device market stalls. Last week the Finnish firm said it will buy social networking firm Plum Ventures, adding to recent deals with cellity, bit-side, Loudeye, Twango, Enpocket and Plazes.