I am also reading above and elsewhere about APRS, and I think I understand that with this the (more expensive) sender in the rocket is somehow broadcasting its GPS coordinates, something that has to be decoded, then viewed on a map on a laptop, or better yet a smart phone. Since I already have an iPhone with it's map/gps capabilities, is there a simple receiver set up that would cable right into my iPhone and have the rocket location appear on the map - the same map that already has my location? There are definitely some APRS apps for iPhone, but I am having a hard time working out what they even designed to do.