When your car is connected, your car stereo is too. That means it isn’t just your navigation system getting your GPS coordinates, but also potential radio advertisers trying to sell you concert tickets or toasted sandwiches.

Harman’s Aha Radio and location-based advertising firm Placecast are testing out a new ad format on vehicles embedded with Aha’s internet radio and content streaming system, which includes several newer Ford(s f), Chrysler, Toyota(s tm), Honda(s hmc), Subaru and Porsche vehicle models.

The long of the short of it is that when Placecast’s geofencing technology detects you’re near an advertising partner’s retail store or restaurant, Aha will insert an audio and visual ad into its internet radio stream that will give you the option of receiving an email coupon for goods or services. The companies are testing the new ad format out with sandwich chain Quiznos in U.S. cities. As Placecast and Aha…