导标或导灯(Range marks,rangelights),又称引导标或引导灯(Leadingmarks,leading lights),以下统称导标,是目视航标的一种。它可以是以一前一后两座标志组成一条直线,称直线导标,人们平常提到的导标实即此种直线导标;或以一前两 Range marks, rangelights, also known as leading lights or leading lights, hereinafter referred to as guides, are a kind of visual beacon. It can be one after the other two signs form a straight line, said the linear guide, people usually refer to the guide that is the kind of linear guide;