Maybe it’ll finally mean marital driving bliss? Or a new confidence boost for the directionally challenged? General Motor’s OnStar division has signed a deal with online company MapQuest.

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The new service, OnStar eNav, will enable subscribers to have directions sent from their computers to specially-equipped vehicles.

Once the directions have been sent to the user’s car, they can then be accessed via voice-guided commands.

In 2009, under the terms of the agreement, eNav users will be able to download directions directly to their vehicle’s screen-based navigation system.

OnStar has also announced a new service, Destination Download, where subscribers with screen-based navigation systems can press a button and be connected to an advisor.

This advisor will then find the driver’s location, send it to the system and an icon will pop up on the car’s screen prompting the driver to input where he/she wants to go.

Once the system is notified of a final destination point, it then sends turn-by-turn directions and drivers can continue on their journey.