When you're working in the middle of nowhere, grab that sat phone and call up Globalstar. The company provides satellite voice and data service to remote areas where landlines and cell towers are few, if anywhere. Its network of satellites and ground stations provides service to more than 688,000 subscribers worldwide. Customers include the US government as well as companies in the energy, maritime, and mining industries with job sites underground or out at sea. Half of its ground stations are operated by independent companies that buy Globalstar's services on a wholesale basis. It also sells a handheld GPS navigation system called SPOT for adventure travelers or anyone needing a GPS device.