相对运动显示 meaning in English

relative display
relative motion display

For displaying the initial date aquired from sea chart correctly in three different display modes ( relative head up motion , relative north up motion , true north up motion ) , a series of coordinate conversion are necessary . in the second chapter , data structure and various coordinates conversion are discussed in details
要使从海图录入的原始数据能够在3种不同的显示方式(船首向上的相对运动显示方式、北向上的相对运动显示方式和北向上真运动显示方式)下正确的显示出来，必然要在几个坐标系(图板坐标系、屏幕坐标系、平面直角坐标系和地理坐标系)中进行一系列的坐标变换。