Unverified50% confidenceDecision RuleTime unknown
越野跑/登山选带双频GPS（L1+L5）的机型，多路径误差比单频降低50%以上，峡谷、密林、高楼间的轨迹漂移明显减少；单频GPS在开阔路跑足够用
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50%
Confidence
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