This is GENIUS!!! If you've ever forgotten where you parked your car, (and I think we've all been there), you end up walking circles and getting seriously frustrated trying to find it again. This especially stinks if you happen to be wearing heels. Well, Google Maps has a new feature that lets you mark your car's location, from your phone, as soon as you park! It puts a big "P" on your map so you can go back to it later. Apple Maps has a similar feature.
Just don't forget where you put your phone. ;)