Troops in combat zones, workers in remote areas, hikers and mountain climbers are an emerging market for providers of two-way tracking devices. The technology so far has mostly been used by the Defense Department, but as price points come down it is becoming a more attractive alternative for non-military buyers. National Defense Magazine writes that two-way satellite alerting and messaging systems have been around for a long time. But personal location device providers now see potential new customers as electronics become more miniaturized and the availability of two-way satellite services increases.

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