Going wireless risked security and production troubles: People might toss them onto the field or the wireless signal might fail.

WSJ: Menu

But they say it's also a signal that Israel could act militarily if all diplomatic efforts fail.

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However, GPS signals can fail or be fooled by a conflicting radio signal, said Professor David Last, an advisor to the to General Lighthouse Authority.

BBC: Navigational backup to aid ships in Dover straits

But the fund was seen as another way to signal that a limited group of companies are too big to fail.

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"If Citi is allowed to fail, and GM is allowed to fail, those are the kind of bell-ringing events that could signal a bottom, " Arnott said.

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