Radar (RAdio Detection And Ranging) is an object-detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
— Battlelog Description
Air Radar is an air vehicle specialization that is also available for mobile anti-air vehicles. Once unlocked for a particular vehicle type, it can be equipped in Customization. The Air Radar increases the size of the player's minimap and shows the location of all friendly and enemy air vehicles on the map. However, ground vehicles and players will no longer be visible.
Air Radar is currently bugged, saying that it is a "Permanent Upgrade", although you still have to select it in customization.
- The 1.03 (December 2011) Patch adjusted Air Radar behavior so it now only shows air vehicles not protected by Below Radar, missiles, and landmarks such as control points.
- Patch 1.06 (September 2012) restored tracking for friendly air vehicles, allowing for better team coordination.
— In-game description
Air Radar is a default vehicle specialization featured in Battlefield 4 for all jets. It may also be unlocked for scout helicopters, attack helicopters, mobile anti-air vehicles and attack boats. The Air Radar increases the size of the player's minimap and shows the location of all friendly and enemy air vehicles on the map. However, ground vehicles and players will no longer be visible.
When playing Hardcore, the Air Radar will be disabled in game due to the mini-map being turned off. As such, it is recommended that players chose a different specialization before deploying.
— In-game description
Air Radar is a vehicle upgrade featured in Battlefield Hardline. In a manner similar to the Battlefield 4 counterpart, it increases the size of the player's minimap and shows the location of all friendly and enemy air vehicles on the map. Despite that, ground vehicles and enemy targets are no longer able to be seen on the minimap.
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— In-game Description
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