Unverified50% confidenceDecision RuleTime unknown
登山/滑雪选表应认准气压式海拔计（Barometric Altimeter）而非纯GPS海拔，气压式精度可达±1米且响应快，GPS海拔误差常达±10-30米，且能通过气压趋势预警天气变化（暴风雨前气压骤降）
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