dead reckoning

calculation of one's position by log2(1) or compass (when visibility is bad) （当能见度很低时）靠测程仪或罗盘定位的测定法.

DBE, DC, DD, DDT, de facto, de jure, de luxe, de rigueur, de trop, de-, de-escalate, de-escalation, de-ice, de-icer, deacon, deaconess, deactivate, dead, dead heat, dead man's handle, dead weight, dead-beat, dead-pan, deaden, deadened, deadline, deadliness, deadlock, deadly, deadly nightshade, deadpan, deaf, deaf mute, deaf-aid, deaf-and-dumb, deafen, deafening, deafeningly, deafness, deal,