Here's something I didn't realise 'til I looked it up last night, as I waited in a vast car parking area at 11.15 pm to collect a couple of teenage girls from a concert. (Don't worry, one was my daughter.)*
You can tell Google Maps to show your location to someone in your contacts, and just for a limited time.
A very helpful idea when trying to meet someone in an open, crowded area.
* I had heard people complaining before about the complete failure of the Brisbane Entertainment Centre and/or Council to work out a way to let the car park empty in less than about 75 minutes after a concert. Yes, it's all true. Hard to believe, really, given the way the centre is not far from two major roadways you can use to get into the city.