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| dead reckoning segment (仪表进近程序无法获得航迹引导的一段，介于开始进近段和中间定位点之间。在进近操作时，仪表着陆系统 (ILS )程序可能包括从一个定位点到航向定位信标之间的航位推算段。航位推算航迹与航向信标以45°角交叉，且长度最大不超过19km 。交叉点就是中间段的开始，该阶段可以获得适当的下滑道信息) | |||
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