Final answer:
To assist in tracking response unit locations and conditions at a scene, a TC could use GPS tracking, radio communication, status reports, and an incident command system, while simpler tools like cotton-tipped applicators might be used to localize injury when advanced imaging is not available.
Step-by-step explanation:
To track response unit locations and condition, especially if a unit has been at a scene for some time, a tactical commander (TC) can implement several strategies. While advanced imaging techniques like magnetic resonance imaging (MRI) or computed tomography (CT) scanning can localize injuries, they are often not available on the scene. Instead, simpler tools such as a cotton-tipped applicator can be used to assess and localize damage when immediate decisions about moving a victim are necessary. However, for the overall tracking of units, the TC could employ a variety of tools and techniques. These could include the use of GPS tracking devices, regular check-ins via radio communication, status reports, and implementing an incident command system which can help manage and track resources including personnel and equipment.