Hi, Guy. I got a problem that my phantom has no response to CL/HL switch. I had checked it with NASA assistant software. No error code reported. Advanced calibration done. IOC turned on and switch on remote functioned normally in software test. However, on field, I followed all sequences that lights green and GPS locked. It flied smoothly with GPS mode and hovering steadily. ATTI mode is also working normally. But, phantom showed no response to CL/HL switch, and it goes as the same of IOC off, showing no reference to the take off location. Do you ever experience so? Or anyone knows what's going on or what I can do to check or resolve it. Thanks much, Any suggestion is welcome.