The US Navy is about to enter upon carrier deck trials of the Northrop Grumman X-47B technology demonstrator (shown below - image courtesy of Northrop Grumman). It's an unmanned, stealthy strike and reconnaissance platform, designed to demonstrate that UAV's can successfully operate from the cramped, challenging confines of carrier decks without needing pilots. If the trials are successful, a successor aircraft is likely to enter service during the next decade.
Part of the challenge facing the X-47B is to make its way around a crowded flight deck, moving around other aircraft and obstacles without running into them, turning its potentially damaging jet exhaust towards people and delicate equipment, etc. To do this, a strap-on aircraft direction device is worn by a crew member, who uses it to issue instructions to the UAV as to where and how to move. It's known as the Control Display Unit (CDU). Here's a video clip demonstrating how it'll work.
The X-47B goes to sea next year to commence carrier deck trials. This technology is a critical component in making them work.