I know that there are devices and services of various sophistication and price that use GPS and worldwide cellular all built-in to one convenient package... for a price.
I'm looking to do it with just a cell phone and the $15 SIM I usually buy at the destination country airport.
The main feature I want is to allow people to go to a map and see my track with timestamps for a week or two. That would mean pushing my position to the Internet every hour or so and then having that list plotted on a map when the user goes to a specific web location. I could easily write an app to push the location to a Google drive, but don't know where to find a service to plot it. Besides, I figured something like this is out there already.