Final answer:
The power company employees use binoculars to maintain visual line of sight with the small UAS because the vehicle cannot get close enough to the powerlines.
Step-by-step explanation:
The power company employees use binoculars to maintain visual line of sight with the small UAS because the vehicle cannot get close enough to the powerlines. Binoculars allow them to see the UAS clearly from a safe distance without compromising their view. The powerlines may be too high or located in areas that are difficult to access, making it necessary to use binoculars for maintenance.