N a chart used in plane sailing, in which the lines of latitude and longitude are straight and parallel 平面海图
plane arrangement chart平面布置图
complex number plane chart复平面圆图
chart plane赤道面
geomagnetic chart equatorial plane地磁赤道平面
N（名词） a chart used in plane sailing, in which the lines of latitude and longitude are straight and parallel 平面海图