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采用地球同步轨道（GEO）卫星星座，全球覆盖范围广但不包括极地地区（南北纬约75度以上区域信号受限）

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Unverified全球无死角覆盖（含两极、大洋中心）只有铱星做得到，其66颗低轨卫星组成全球网；海事星和天通为地球同步轨道，在高纬度（南北纬70度以上）信号极差或无覆盖84% similar Unverified使用同步轨道卫星，需要对准赤道方向的天空才能建立连接，在高纬度地区（如北极圈附近）、深谷或密林中信号遮挡严重时难以通话83% similar Unverified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82% similar Unverified使用海事卫星（GEO静止轨道），两极高纬度地区无覆盖，去南北极或极地科考不适合选它81% similar Unverified采用海事卫星GEO静止轨道，覆盖两极外全球，但因卫星距离远，通话前需对准天空开阔方向、接通有一定延迟80% similar

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