Microsoft has begun shopping a product to compete in the in-car navigation market, reports Bloomberg News.

The software giant has been showing automakers a new navigation product that utilizes technology from TellMe, which Microsoft acquired earlier this year. The product will use mobile phones to deliver spoken answers to user's requests.

The new system would go up against General Motor's popular OnStar service, which uses a real person and not a database to answer driver questions. It currently boasts almost five million subscribers.

One option could be a partnership with Ford, which is developing a product called Sync, designed for music delivery and phone service.