Superseded90% confidenceDecision RuleTime unknown
户外运动/越野跑需选双频GPS（L1+L5）机型，单频GPS在高楼/密林环境轨迹漂移可达数十米，双频定位精度可控制在3-5米内
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This knowledge claim has been superseded by newer content
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Sources
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