-------------------------------------------------------------------------------- A - C D - F G - M N - S T - Y A - C 1 PPM - 1 Pulse Per Minute ----- 分脉冲 1 PPS - 1 Pulse Per Second ----秒脉冲2D ---- 二维定位

Track-Up Display - 航向向上显示Track (TRK): 航向Transceiver:步话机、收发两用机Transponder: 雷达应答机、（卫星通讯的）转发器、脉冲转发机Transducer: 渔探用探头、传感器Triangulation: 三角测量True North: 真北Turn (TRN): 现时航向和目的地之间的夹角Two-way: 双向的、双路的、双通的Unive