General Motors' (NYSE:GM) OnStar unit and Time Warner's (NYSE:TWX) AOL MapQuest unit have announced an expanded pact for OnStar subscribers to plan their driving routes on MapQuest.com. The joint venture would send a destination right to OnStar's Turn-by-Turn Navigation service. This new Turn-by-Turn service enhancement is being called OnStar Web Destination Entry. It will allow subscribers to use MapQuest to research and plan their driving destinations with what is being called "more than 15 million points-of-interest" available through the mapping Web site. This will be available to more than 2 million GM vehicles in 2007 and an additional 3 million vehicles in 2008. The companies will start a Web Destination Entry pilot program in the summer of 2007 and the service will be available to all OnStar subscribers in late 2007 with Turn-by-Turn Navigation-capable vehicles. OnStar Turn-by-Turn Navigation, a GM exclusive that was available in all Buicks and Cadillacs, is additionally available for a $100 service plan upgrade on many other new GM cars and trucks during the first year of service. If you read into this, it is a "good news and (not really) bad news" scenario. The good news is that GM drivers will get some new GPS-alternative mapping instructions at a lower cost than a pure navigational system that can run north of $1,000 in some models. It also shows how easy future offerings can be integrated via satellite right into Onstar and other driver assistance services for cars. The bad news is that this will probably not act as a catalyst that will make a huge difference to GM's auto sales and it may not add drastically to the bottom line at AOL. The good news (inside the bad news) is that the bundling looks like whatever it does generate in revenues will mostly go to the bottom line after a minimal amount of subscribers.