Can anyone suggest why my outer, middle and inner markers suddenly fail to work ??I have them selected in comms, and have tried a variety of airports and aircraft, but not a squeak.John Amm.

John,Try jacking up the 'Navigation' and 'Cockpit' sound sliders, if you haven't already.Also, it might not be so unrealistic to not hear those markers. Take a look at some of these NOTAMs:PIT 10/045 PIT 28R ILS OM DCMSND PIT 10/044 PIT 28L ILS OM DCMSND PIT 10/043 PIT 32 ILS OM DCMSND PIT 10/042 PIT 10L ILS OM DCMSND PIT 10/041 PIT 10R ILS OM DCMSND IAD 04/018 IAD 19L ILS MM DCMSND IAD 04/017 IAD 19R ILS MM DCMSND IAD 03/026 IAD TFR SEE FDC ZDC 3/2126 JFK 04/084 JFK 31R GRIMM NDB/ILS LO DCMSND JFK 04/083 JFK 22L LORRS NDB/ILS LO DCMSND JFK 04/082 JFK 22L ILS OM DCMSND JFK 04/080 JFK 31R ILS OM DCMSNDPAGE 01 06JAN04 Those are just a couple examples, so it seems a lot of airports are getting rid of the OM's, and a few are even getting rid of the MM's.Best Regards,NickBlue Ridge Dx

Thanks NickI'll check that out.John Amm.

Does this happen with every aircraft?Check aircraft.cfg(Radios)// Radio Type=availiable, standby frequency, has glide slopeAudio.1=1Com.1=1, 1Com.2=1, 1Nav.1=1, 1, 1Nav.2=1, 1, 0Adf.1=1Transponder.1=1Marker.1=1 <------

I first noticed it with the add-on Piper Archer, however it now seems to affect all default aircraft.I have now checked aircraft.cfg but it matches your sample.I have also turned up the Nav & cockpit sounds.Still no change - this is a complete mystery! An annoying feature is that the Piper Archer has a check button for the marker indicator lights. This works OK, but still the marker lights / sounds fail to operate in flight!John Amm.

Is the "Mkr" button lit on the audio panel? R-

To allThe mystery appears to be solved, and it is down to my own lack of knowledge.A provider of airport scenery in the United Kingdom (which is where I had the problem) has pointed out that virtually no airports in the UK use the OMI system !!!This is obviuosly a bit of a Homer Simpson moment (Doh!), but thank you all anyway for taking the trouble to reply.John Ammundsen