Unverified50% confidenceFactTime unknown
PLB（个人定位信标）与卫星通信器（如inReach）的核心区别：PLB仅在紧急时一键发送求救，无双向通信、无月费，直连COSPAS-SARSAT官方搜救网络；卫星通信器可日常双向短信但需月度订阅费
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