What does 'air contacts' refer to in tactical operations?

In tactical operations, 'air contacts' specifically refer to aerial objects that are detected during surveillance or reconnaissance activities. This term is often used to describe aircraft or other flying objects that are monitored as part of the operational environment. The phrase "top half depicted" indicates that these air contacts are represented in a way that highlights their altitude or position in relation to other navigational elements.

Understanding this terminology is crucial for effectively communicating in military contexts, especially when coordinating engagements or identifying potential threats. In contrast, subsurface objects, floating debris, and surface vessels pertain to different categories of contacts that would not be classified under 'air contacts.' Each of these refers to items located underwater or on the water's surface, which are distinct from airborne entities, emphasizing the importance of precise terminology in tactical discussions.