I once saw a man have a heart attack on the beach, less than a 5 minutes drive from a fire-station and rescue team. A helicopter arrived after 45 minutes, and the man was deceased already. That was in Martinique, french Caribbean.
There's a need for an app to let patients track the ambulance. It's been possible for 10+ years, as seen with Uber. It seems existing products have focused on tracking only for the purpose of managing a fleet, missing the focus on patients needs.