Runners share their location. Spectators watch the whole field move together — with the real gaps between them, in metres and in minutes.
Your name, your race, and a photo if you want one. No account, no password.
A free app called Traccar Client (best — keeps working with your screen off), your Garmin LiveTrack link, or your phone's browser as a fallback.
Share the map link. Anyone can see where you are and how you're doing against everyone else in your race.
During the race, anyone with the map link can see where you are. That is the point of it — but it is worth knowing before you sign up.