Chief among these is the urgent suggestion that mere possession of jamming equipment be made illegal.

BBC: UK 'over-reliant' on GPS signals, engineers warn

British police began finding jamming equipment in the possession of criminals about three years ago.

ECONOMIST: GPS jamming

"It's already illegal to put GNSS jamming equipment on the market in the UK, " said Prof Jim Norton.

BBC: UK 'over-reliant' on GPS signals, engineers warn

The planes are equipped with radar-jamming equipment capable of knocking out electronic devices.

BBC: Australian Prime Minister Julia Gillard

There are indications Iran is acquiring more-sophisticated jamming equipment.

WSJ: Censorship Inc.: In Skies Over Iran, a Battle for Control of Satellite TV