lost car in supermarket carpark

The day we moved into this house, I drove down to the local Morrison’s superstore to get some stuff for lunch. My first visit. When I came out, I looked all over the car park and couldn’t find the car anywhere. Panic set in. I went back into the store and said to the security guard that I thought someone might have taken my car. He said “have you searched both car parks madam?” They had two entrances, each with adjacent car parks and I had entered through one and exited through the other without realising it! I felt very foolish, but relieved.

I spent 20 minutes once at a large car park looking for my car then realised I had taken DH's.

Sorry, that wasn't much help.
At our large Mall all the rows are marked clearly A1 etc, so I try to remember to make a note of the number of the row. And I usually try to park in the same area if there is space.

Years ago I took delivery of a new car and went to Tesco on my way home from work.
I came out of the supermarket, went to my car, pressed the zapper, but it wouldn't open. I was beginning to panic when the trolley boy, a former pupil, came up and said: That's not your car, Mrs Marydoll, that's yours over there. I saw you parking it!

If you get there early, when it's fairly empty, try to park near a landmark. Next to one of the trolley bays for example, or at the very end of one of the lanes.
Have you got a smart phone? If so, take a photo from your car looking directly towards the store. Walk in a straight line to the store and take another photo looking back towards your car. These should guide you when you come out.
Secondly, make a point of always parking in the same part of the car park every time you go there. Then you won't have to search all round, you'll at least know which area to look in!
Good luck