Tenzing Communications, a Seattle-based provider of satellite-based email and text-messaging for commercial airline passengers, is expanding its product offering to the maritime industry. The company recently completed the trial of an e-mail system that lets cruise line passengers and crew members use their existing private and corporate e-mail accounts. The trial was carried out with Lindblad Expeditions, a N.Y.-based cruise line, and is the first step for Tenzing into the maritime market. Tenzing is investigating launching a maritime product in 2004.