Also they are an "aid to navigation" as in NAVAID. You would have planned everything and have the necessary charts on hand.
Of course, I have all the necessary lines on my chart and a huge wadge of planning paperwork in the cockpit (obviously, I do all my planning on my days off or I delay take off for a couple of hours if something changes on the day). I turn the brightness right down when flying along the edge of controlled airspace, so I'm not tempted to look at the display, to make it more difficult for myself, like a proper pilot always should.
In fact I'm hoping to go back to analogue instruments later this year so I can keep myself on my toes. As for TCAS, I'm not going to ever take notice of
that. This modern stuff makes us all soft.
