One thing people don't understand: Part of setting up a PNA or other
moving-map display PROPERLY is setting it up so you don't _*need*_ to
stare at it to get important information. :-)

For example: With LK8000 on my PNA I set it up so landable points that
are within glide range (with a safety-margin) are highlighted big and
GREEN. Unreachable ones are marked in RED. At a glance I can see if
there are big green dots on my display - meaning that I have options
if things start to go to hell. I don't have to scroll through lists or
have my brain interpret numbers and letters (which take a certain
amount of processing and interpretation by the brain). I just know
that "Green Dots" = Landout Options. And at a glance I can also see
roughly in what direction they are and how far away they are, relative
to me.

Now, secondarily I have LK8000 display my arrival altitude next to
each green dot (again, with a safety margin built-in). IF I have time,
I can look at that number and decide how easily I can make it to that
point. And if the cockpit workload is low enough, I can glance at that
number once every 30-60 seconds over a 3-5 minute period and easily
detect if the number is growing or shrinking. If its growing, I'm
"beating" my glide and can have confidence I'll make it there. If the
number is shrinking, then I know I'm not likely to make it, given the
way my glide is trending (badly). However, all of these mental
gymnastics are secondary tasks. I only need to glance at the screen to
get "the big picture" and the overall gist of things.

There are lots more examples I could give like this (such as a bright
PNA with good terrain coloration helping you visualize whether you're
flying into rising or lowering terrain, whether you have to cross
mountains or valleys in your path, etc); but hopefully the example
above helps get the point across.

--Noel