Figure: G450 SVS Terrain, from G450 Aircraft Operating Manual, §2B-06-50, figure 32.
The G450 is very well equipped to adhere to one of my fundamental rules of life:
Always fly in the middle of the air, avoid the edges.
The edges are defined by the earth, buildings, ground objects, water, and extraterrestrial space.
You have several allies when it comes to CFIT, among them:
What follows comes from the references shown below. Where I think it helpful, I've added my own comments in blue.
There are two levels of Enhanced Ground Proximity Warning System (EGPWS) warnings in response to terrain: TERRAIN or PULL UP. The only difference in pilot response is that the TERRAIN warning does not include retracting the speed brakes. You should respond, however, in either case as given for a PULL UP:
While the G450 procedure leaves them out, don't forget to stow the speed brakes. Had the crew of American Airlines Flight 965 at Cali done so, they might have lived.
If you remember anything, remember this:
If your aircraft doesn't have synthetic vision and you control your flight department's budget, allow me to make a buying recommendation: synthetic vision offers the greatest safety advance for the dollar available today.
If you have synthetic vision, you should use it. If you are low to the earth with the stick shaker going off, wouldn't you like to trade your circa-1940 attitude indicator for this:
Figure: G450 Synthetic Vision, with a few of my crayons, from G450 Aircraft Operating Manual, §2B-06-50, Figure 32.
Why not just fly the flight path vector? That's what you do on an ILS, after all. Keep in mind it is an instantaneous readout of where the airplane is going, it will be jumping all around the place and if you chase it, you will be flying erratically enough to cost climb performance. Just smoothly fly the boresight as you would a "normal" airplane and watch how the flight path vector reacts. If it jumps into the terrain now and then, raise the boresight a little. Try this in the simulator, it only takes one try to understand why.
Gulfstream G450 Aircraft Operating Manual, Revision 35, April 30, 2013.