M ENGINE_MESSAGE_L (5) : the navigation message to process Used for process instance navigation.
M ENGINE_MESSAGE_L(5)：流程的导航消息用于流程实例导航。
The BDT is related to the Coordinated Universal Time, and the time bias information is broadcast in the navigation message.
北斗系统时间基准（北斗时），溯源于协调世界时，时差信息在导航电文中发播；
The specific points of GPS measurement mechanism are one way electromagnetic signal propagation and transparent navigation message.
GPS测量机制的特点为单向电磁信号传播及透明的导航电文。
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