Unverified88% confidenceDecision RuleTime unknown
选购滑雪追踪器需确认支持多频段GNSS（L1+L5双频）+GLONASS/Galileo/北斗多系统，单频GPS在深峡谷和树林密集区定位漂移可达10-30米，双频可压缩至3-5米
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