DEspitE thEir vAriED DEsigns, nAvigAtion ComputErs usED in CArs ______.
A．ArE morE or nEss thE sAmE priCE
B．proviDE DirECtions in muCh thE sAmE wAy
C．work on morE or lEss thE sAmE prinCiplEs
D．rECEivE instruCtions From thE sAmE sAtEllitEs