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You said you had seen electronic versions of the tennis ball and a string. How about a system of a BUNCH of tennis balls on strings? Park your car inside the garage with the assistance of someone else to get it in straight, then hang tennis balls. You can get it to a point that you create a halo of tennis balls that would tell you that you're parked in the right spot. =)
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Old signature just wasn't doing it for me anymore, so now I have this new one. It's equally as stupid but at least it looks really long. I'm probably just going to keep typing until I run out of things to babble about and see how many people actually read this. I once ran down a hill, fell down and hurt my elbow; my mom said I would be ok, she kissed it and made it all better. I've run out of things to say now, so if you have read this whole thing, congratulations you get a gold star!
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