@meetearl APRS would be a piece of cake for Earl. It has all the necessary ingredients built-in, all it would need is an app to take advantage of them. The current Android apps require a separate radio, but that goes out the door with Earl.
I think of Earl as a harbinger of things to come: devices and/or objects built around the CPU and OS, not a hack job where the CPU and OS are imposed on existing tech. Toyota is about to build a car for the Asian market that has a Nexus 7 included as the infotainment/data display for the vehicle. Why bother with custom built, essentially non-upgradeable electronics when you can just swap out as needed?
Earl is there, man. Smartphones have their uses (I have one, and a Nexus 7), but they're not everything, yet.