I recently bought both devices and have tried to find out how to use the 515 in radar only mode (as mentioned by some reviews) I have tried pairing and unpairing to the Edge 520+ but it only seems to identify as radar even when searching for "lights". If I push the Varia button 4 times so that the light turns off (but the Bt blue led is still flashing) then the Edge immediately disconnects. Did Garmin decide to remove the Radar only option and if so what is the #5 button push for?? If I try to pair in that mode then nothing is discovered. Both devices are using latest software.