I got my whole setup working today. I got the Bad Elf Pro (external Bluetooth so it doesn't have to be connected to the iPad). It is super easy to setup, super fast to get a signal, and the PDF Maps app works great. I tethered to my phone for data on the bus today, and kept downloading maps of Colorado. I loaded a map for the city of Boulder and it popped my location right where I was, and it moved with me! SO cool, everything is working really well and I can't wait to use it on the trail!