The EVA portable unit was an interesting technology developed by GDI for it's Commandos. It was essentially a highly advanced computer capable of tracking mission data, interfacing with satellite scans and collected intelligence, providing a communications interface and even hacking other computers via a wireless transceiver.
It was a powerful asset, but not without its flaws - areas with strong electromagnetic interference (such as near communications centers) would render the radar useless while it's commlink wouldn't work while underground. In the Second Tiberium War EVA units are helmet mounted.
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