When I fly where ever, I find it’s easiest just to leave my car parked at the long term garage (as opposed to a taxi or a friend). Before I go on my trip, I empty my camera’s memory card. The first photos I take on my trip are my parking spot number and the section of the garage I’m parked in. That way, when I return, there’s no worry in trying to find my car. Sure I could just write it down, but this is even faster. Now, I just turn the camera on and scroll back around to the first photo.