I can connect an iPhone to an external GPS device, but when I use another iPhone to also try to connect to it, it won't connect.
But there are posts that stated we can connect two iPhones to a single Bluetooth device. Does it depend on the Bluetooth device?
It makes sense if the GPS signal can be provided to two iPhones if there are two people hiking together, but maybe it takes extra design steps to make such a Bluetooth device.