Unverified50% confidenceDecision RuleTime unknown
铱星（Iridium）网络是唯一真正全球覆盖含两极的低轨星座，海洋、高纬度极地探险必选铱星设备；北斗短报文仅覆盖亚太及一带一路区域，出国远行不适用
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