In a race, maybe...but not just for the helluvit. You're approaching the realm of TMI on the internet. Some would argue that even posting where you have been is TMI, but posting public live tracking information crosses that line for a lot of people.
It's one of those new things that brings a mixed bag of new tricks. The purpose of personal live location reporting here is for minimizing the time it takes to find a lost or injured rider. It only reports a rider's last location and time. That's only for the duration of a ride, there's no location updates at other times.
Most people do seem to prefer restricting their live location reports to those close to them. It makes sense to share your location only with those who would first notice your absence in case of an accident, they can pass it to others when the need arises. I assume that's how most riders would approach using a live location reporting system.
I see it being done in races and endurance events like Iditabike. The GDR and other long distance events are using it (see Trackleaders). Scott Morris (Krein on MTBR) of TopoFusion has been involved in that. They are using Spot transmitters or similar.
I tracked and watched Mike Curiak cross the line on his solo self supported effort last year, via the tracking and a live webcam. Unless you are in a big race and your family wants to watch you, I see no real use and the costs are likely pretty high.
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