Originally Posted by
Tedgrrrr
The main point though would be so you can know how far away from your destination you are at all times.
I'm lucky in that I have a very handy little gadget called a watch, and a quick glance wristwards is usually all one needs to determine how far away I am from my destination.
It must be nightmarish to have sit there in complete ignorance of progress on your journey without a dedicated screen in the ceiling to show you.