ATSC Convertor Box With GPS Display

 

I am wondering if anybody here knows if I were to get an ATSC convertor box, could I watch over the air digital broadcast television by using a Garmin Nuvi 5000 GPS as the display device?
https://buy.garmin.com/shop/shop.do?cID=134&pID=11547
The Garmin indicates that it "includes a composite video input so you can connect it to a rear-view camera for backing up safely." Do any of the convertor boxes use composite video outputs?

Not one small enoug to want it as a GPS accessory

Plus, it would make mounting options few, because as a TV/video display, it could never be mounted in the driver's line of sight.

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*Keith* MacBook Pro *wifi iPad(2012) w/BadElf GPS & iPhone6 + Navigon*