Pilotfirst9999

Hi Ini support Please explain how to swap CDI 1 source (which is on the GNS 430) to CDI 2 source (and on upper panel) and navigation cdi which is on the co-pilots side. Where is the button to do this. I see that the VLOC frequency can be followed using the 430 and the next standby frequency can be entered and swapped to using the swap button on the 430. Basically how does this Nav 2 work please? With a step by step instruction on how to swap from nav 1 to nav 2 using copilots CDI which unfortunately has a broken course deviation needle which is remaining static at 90 deg. Regards Pilotfirst9999