You have an excellent imagination. This idea is near to something that I'm interested in designing. I was looking for an app to allow me to setup channel viewing sets and record them automatically by phone. My TVs are in a different room from the cable entry point and the remotes don't have feedback to tell you what the result is when you are in a different room.
Another idea came to me about having GPS tracking allow two people on the phone display the routes to each other and to control a tracking vehicle's steering. Anyone have any actual data on GPS accuracy? There is a possible commercial use here. So, if you are interested, give me a call. I'm a programmer with 30 years of experience in computer application design. Thanks ahead of time for those who want to try this out. Oh, by the way, where can I get inexpensive unlocked smartphones for testing?