Well they should have written better dialog, because that's not what they wrote into canon.
During the Cold War, people casually referred to the United States and its allies as "the Western Hemisphere" even though most of Europe, including several NATO members, is east of the Prime Meridian. Is it real-world canon that that Prime Meridian actually ran through the border between East and West Germany (at an aggressive angle rather than pole-to-pole) and not Greenwich, since that matches up better with the canon dialog?
Navigational and cartographic conventions don't always line up conveniently with politics.