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Audiovisual education. A professor using an LCD projector as an instructional aid. Audiovisual education or multimedia-based education ( MBE) is an instruction method where particular attention is paid to the audiovisual or multimedia presentation of the material to improve comprehension and retention.
Air-to-ground communication. The earliest communication with aircraft was by visual signalling, ground-to-air only. Air-to-ground communication was first made possible by the development of two-way aerial telegraphy in 1912, soon followed by two-way radio. By the Second World War, radio had become the chief medium of air-to-ground and air-to ...
Manually operated visual landing aid system (MOVLAS) MOVLAS repeater on integrated launch and recovery television surveillance system (ILARTS) The MOVLAS is a backup visual landing aid system used when the primary optical system (IFLOLS) is inoperable, stabilisation limits are exceeded or unreliable (primarily due to extreme sea states causing ...
In all, 44 World War II campaigns were designated by the U.S. Army: 24 for the Asiatic – Pacific Theater, 19 in the European – African–Middle Eastern Theater, and one in the American Theater. In addition, there were three main blanket campaigns: antisubmarine warfare, ground combat and air combat. These were designated for each theater ...
An aerial lighthouse located in Pansio, Turku, Finland. An airway beacon (US) or aerial lighthouse (UK and Europe) was a rotating light assembly mounted atop a tower. These were once used extensively in the United States for visual navigation by airplane pilots along a specified airway corridor. In Europe, they were used to guide aircraft with ...
First-person view through night-vision goggles of the FBI Hostage Rescue Team using an airboat. A night-vision device ( NVD ), also known as a night optical/observation device ( NOD) or night-vision goggle ( NVG ), is an optoelectronic device that allows visualization of images in low levels of light, improving the user's night vision.
Aerial reconnaissance in World War II. This Supermarine Spitfire PR Mk XI (PL965) was a purpose-built long-range, high-altitude reconnaissance variant that was capable of flying from airfields in England and photographing as far afield as Berlin. A transformational growth in aerial reconnaissance occurred in the years 1939–45, especially in ...
The Battle of the Beams was a period early in the Second World War when bombers of the German Air Force ( Luftwaffe) used a number of increasingly accurate systems of radio navigation for night bombing in the United Kingdom. British scientific intelligence at the Air Ministry fought back with a variety of their own increasingly effective means ...