On approach I am not getting the sound bip for Outer, Middle and Inner Markers.I will apprecaite any help regarding the reason for this discrepancy and how to solve this in order to get the above captioned markers alerts.Thank you for help.Benny

You need to activate it from the cockpit, usually amoung the same set of switches used to enable Nav,ADF, and other idents.David

Also note that it is impossible to allocate any sort of key or button press to activate MKR audio. It seems MS forgot to include this feature. The only way is to click the button with the mouse. Because I fly totally mouse-free, I have the MKR button on permanently. If you choose to do this, simply chnge this parameter in your saved default .flt file:AudioMarkerListen=True(default is obviously False). The MKR button will then be illuminated when you start your flight.