Cameras intended to provide 360-degree surveillance had two large blind spots.

They also provide surveillance of large areas and aid in the strategic deployment of surface crafts.

Underwater sensors guarded the islands, and three different security satellites provided constant surveillance of the entire area.

To the east and west, other aircraft provided surveillance in those areas.

His cane provides surveillance only of the lower altitudes.

Lighthouse provides social work, psychosocial support, legal advice, care and medical surveillance.

It provided air defense and surveillance of the southeastern region of the US.

The first castle was built on a basalt outcrop in the 12th century to provide surveillance over several roads.

Only two weeks earlier, French agents had provided surveillance for the Paris meeting.

Its goal is to provide clinical surveillance in France for 14 health indicators.