Disables the gateway as a departure method, adds checkpoint to plains map as a latejoin and departure location.

code/modules/awaymissions/gateway.dm

@@ -1,13 +1,12 @@
 /obj/machinery/gateway
 	name = "gateway"
-	desc = "A state-of-the-art Nanotrasen gateway, used to teleport rich commuters anywhere in the same planetary system."
+	desc = "A state-of-the-art NanoTrasen gateway, used to teleport rich commuters anywhere in the same planetary system. This is an arrivals terminal; it can't be used to leave."
 	icon = 'icons/obj/machines/gateway.dmi'
 	icon_state = "off"
 	density = 1
 	anchored = 1
 	var/active = 0
 
-
 /obj/machinery/gateway/Initialize()
 	update_icon()
 	if(dir == SOUTH)
@@ -20,7 +19,11 @@
 		return
 	icon_state = "off"
 
+/obj/machinery/gateway/centerdummy
+	icon_state = "offcenter"
 
+/obj/machinery/gateway/centerdummy/update_icon()
+	return
 
 //this is da important part wot makes things go
 /obj/machinery/gateway/centerstation