To get spots to all show up on the same tracker page they need to be registered to the same account. To get them to all update at the same time we spoke about starting the tracking at the same time - at the skippers meeting for example. People could then go fasten them to the boat or crew.
There are apps out there that can make all the spots show up on the same map. Offroad enthusiasts are all about the spots for their expeditions and the ability to call for help.