Unverified75% confidenceDecision RuleTime unknown
选购GPS重发器时外接天线的电缆损耗需纳入计算，每米射频同轴线（RG174）约损耗1dB，5米以上应改用低损耗线缆（LMR195/240）或选择带线缆补偿的产品
1
Sources
75%
Confidence
Long-term
Relevance
-
First Seen
Sources
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Unverified越野穿越或长途货运需要5W及以上大功率手台或车载台，配合外置车载天线可将有效通信距离提升至10-20公里，但5W以上机型多需办理业余无线电或专用频率执照64% similarUnverified重量方面，全功能大屏手持GPS约200-250g，气压计海拔计+三轴电子罗盘会增加功耗但能在静止时提供准确海拔和无信号方位，超轻快速穿越可放弃气压计换取轻量64% similarUnverified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64% similar
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