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This paper describes a novel pedestrian dead-reckoning unit (PDU) to estimate pedestrian's position. The PDU is designed for a narrow bandwidth wireless communication channel such as Bluetooth. The PDU sends not only the PDU posture, but also the abstracted sensor data such as the number of steps, basic information to estimate stride length, and the pedestrian contexts. We developed the pedestrian navigation system by using the proposed PDU. This paper shows the PDU message is compact but contains enough data to realize pedestrian navigation system using Bluetooth.