But you are asking for more ease of use than what I use. That appears to be the stuff you see in movies.
Here's what I use: https://www.greenalp.com/RealTimeTracker/
You will have to have a data plan for this to work no matter which app. I'm using Ting.com since it's under 20 a month with light data use.
I alone will be taking my 8 year old grandchild to Disney World in a couple months. In the event that we would get separated I would like to be able to quickly find her. I have an active Google Pixel cell. I also have an unactivated Google Pixel. I'd like to have her carry my old Pixel to use as a camera for her and more importantly to be able to find her within the park if needed. I like Google maps and I'm hoping that it can somehow be used because it shows my position and the position of the finish goal. This would allow me to see if I'm traveling in the right direction to find her. Is this possible and what would I need to do? Or is there something better than a phone to do this? Thanks in advance.