My apologies for not knowing the proper terminology. I notice that the green lines that highlight the runway on approach, only pop into existence at very low altitude. Videos I've seen of the real HUD, clearly show the runway edges highlighted at much higher altitude. Is this a bug, can it be reconfigured to highlight the runway at higher altitude, rather than a few hundred feet? The feature seems less than useful if it pops into view so low. Martin Wilby

Or have I done something wrong? Anyone? Martin Wilby

I give up!

Martin- I answered your question in the other thread in which you posted it. You can find the details on the AIII mode and it's operating parameters in the Vol 2 of the FCOM.