記錄和標(biāo)繪的羅盤(pán)讀數(shù)最好都是真正的方位.It is best to record and plot all compass readings as true bearings.因此,開(kāi)發(fā)過(guò)程必然涉及到矢量符號(hào)設(shè)計(jì)和標(biāo)繪的問(wèn)題.Therefore it is inevitable to lead to the problem of designing and marking vector symbols....