Max
Really? Wasn't aware of that. Maybe not on our (BA) 'buses [have to look in the tech manual to be sure], I guess it's a customer pin selectable option, but maybe that explains why some 'bus operators fly around with the nav lights on in broad daylight!
We switch them on on entering runway (together with strobes) and off when clean after t/o, then back on with gear and flap 2 on approach (unless in Germany in VFR conditions, then below 10,000ft to avoid VFR traffic).