They are designed to be used with a smartphone app which shows a radar image covering a 200ft (61m) radius.

BBC: CES 2013: Ready for the wearable tech revolution

The type of image displayed on this page is known as a synthetic aperture radar interferogram.

BBC: Christchurch quake mapped from space

Down the road from UCSD, 30-foot screens at the Scripps Institution of Oceanography project geomorphic data obtained from radar, sonar and satellites, combined into a single 3-D image.

FORBES: Totally Wired U.

Liberation Army Daily quotes an "authoritative naval department" as saying that the media reports on radar-locking are a "deliberate fabrication" and "malicious speculation" to tarnish the Chinese military's image.

BBC: China media: Japan radar lock