“信号旗”的英语？

当然在过去，副官掌管着舰队司令的信号旗。In olden days, of course, a flag-lieutenant was in charge of the Admiral's signal flags.我从这个位置完全可以看到信号旗.The signal flag is fully in our sight from this position.请挂上一面 “ 我需要一艘拖轮 ” 的信号旗.Please hois...