Unverified50% confidenceDecision RuleTime unknown
去极地、远洋、高纬度荒野（如阿拉斯加、南美安第斯）优先选铱星网络（Iridium）设备，铱星是唯一实现全球66颗卫星极地覆盖的星座，SPOT依赖的Globalstar在南北纬70度以上有盲区
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