ContourGPS currently has the greatest range of connectivity options, and one of those options, Bluetooth, is finally good for something. The company has just flipped the switch and deployed its Viewfinder app that we last saw at CES, which allows iOS devices to pull live video from the camera, even if it's still stuck to the side of your head and covered in mud. Users can also tweak camera settings in real-time, which is a huge step forward over the previous process that required tethering the cam and booting up some software. However, there is a catch: to use the device you have to install a little card, called a ConnectView, into your camera. This sucker will set you back $29.99, though we're told the upcoming Android release of the app will be able to do without. Unfortunately, that version won't be along until an unfortunately vague "Spring," but the iOS flavor is a free download right now in the App Store.