Nokia's spending spree on small, complementary tech firms continues as the Finnish wireless giant's GPS mapping unit today bought a location-based mobile ad firm.

Navteq, the Chicago-based Nokia (NYSE: NOK) subsidiary that provides digital maps, traffic and location data for wireless devices and vehicles, today acquired Acuity Mobile, whose embedded mobile advertising platform enables location-targeted advertising. Terms were not disclosed.

Acuity Mobile, based in the Washington, D.C. area with a staff of 18, is the second recent tech-boutique acquisition by Nokia, which last week snapped up Plum, a private social networking site.

The additions are part of Nokia's ongoing strategy to morph from a handset maker into a more comprehensive mobile service company.

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