These teleport you back to Sacre Base.
When using the VGA mode, be sure to only use one charge at a time.
You can warp out of combat at the long-range screen and in melee. EMWARP does this automatically when you are defeated, leaving you with one hit point.
You can also use EMWARP to change the place you warp to, either to your current location or back to Sacre Base. (Teleporting to an arbitrary location can be done with a fortress - and 25000000.) This is called your warper anchor point.
A Waypoint mgr (available from Ed's) remembers up to five Warper anchor points, letting you choose between them.