For the airline pilot (and the flight sim pilot) wanting to know what is going on with the airplane systems while they are tryuing to fly, the EICAS is a wonderful reference display. It will show you just what is going on with all that technical stuff related to operating all those complicated systems on the modern jet airplane. To understand it, Captain Mike has dissected the ingenious device and brings clarity to what can be a dark part of the knowledge base of a newbie pilot.