When I fire up my Cincinatti Hawk lathe (Fanuc 21t) the start positopn is about 17" on the X and 25" on the Z

I'm scared to death of crashing this thing so I want to completly understand every thing my cam program is doing.

Looking at the code the first lines are

G18 G20 G40 G80 G90
G00 G28 U0. W0.

The way I understand it G28 is going to send the machine to X & Z 0 which will promptly crash it.

So why is this there? And on a similar topic how do I move the turret to a safe position for tool change? I see that my post might need some editing.