In the past couple of years, I've gotten into running ultramarathons, which are typically in pretty remote areas. Every aid station, in addition to food and drink, typically has a HAM/amateur radio operator transmitting the in/out time of each race participant back to the race HQ. They are also, of course, there to serve as the link to first responders. And they do it for fun, practice, and typically a silly race t-shirt. It's certainly appreciated!