Unverified80% confidenceTradeoffTime unknown
高精度三轴指南针精度高但受周边磁性物质（手机、金属扣、钢制装备）干扰更敏感，使用时需远离铁磁物体至少20cm并做8字校准
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80%
Confidence
Long-term
Relevance
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Unverified指南针(磁力计)会受金属、电子设备磁场干扰，佩戴时若发现方位异常需执行'8字校准'动作；靠近手机、车辆或高压线时读数不可信84% similarUnverified干簧管(磁簧)方案传感器磁铁间距需≤22mm才可靠触发，铝合金/金属门窗会削弱磁场，安装时磁铁与主体错位应控制在15mm内82% similarUnverified磁吸支架吸力需看N级和磁铁数量：4颗以上N52强磁+手机加装导磁片时才能稳固夹持大屏机型；仅靠手机壳内自带铁片吸力通常不足以应对颠簸路面82% similarUnverified磁吸支架方便但会干扰手机指南针和无线充电线圈，部分机型磁吸后指南针校准失灵，对导航精度敏感者慎选磁吸车载款81% similarUnverified磁吸吸力用高斯或磁体数量间接体现，选择内置磁体环≥1000gf吸力的产品，避免边走边充时手机滑落；山寨产品常磁力不足导致晃动断连80% similar
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