One use that personally springs to mind, is if this technology is developed enough, SWAT/Rescue teams could use this to find where people are inside buildings.

One use that personally springs to mind, is if this technology is developed enough, SWAT/Rescue teams could use this to find where people are inside buildings. No need for letter-reading precision, just good enough to be easily deployable on-site and work well enough to find where people/bodies (big masses of water?) roughly are.