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When lives hang in the balance, the route to an emergency must be clear — and clearly communicated — to first responders. For firefighters and emergency medical technicians responding to such calls, getting lost isn’t an option. That’s where computer-aided dispatch systems come in. They incorporate Global Positioning System devices, digital maps and routing software to calculate the fastest route.

Despite LightSquared Subsidiary LLC promising major changes to its nascent broadband network, truckers and technology companies said they are not convinced the revamped system won’t jam Global Positioning System devices critical to freight operations.