flying bridge

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A small, usually open platform located above the main bridge, as on a powerboat, equipped with a secondary set of navigational controls.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun nautical A (usually open) area on top of, or at the side of, a ship's pilothouse, serving as an operating station for the officers in good weather or when manoeuvring in port.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the highest navigational bridge on a ship; a small (often open) deck above the pilot house