Throughout the battle, British ships experienced difficulties with communications, whereas the Germans did not suffer such problems. The British preferred signalling using ship-to-ship flag and lamp signals, avoiding wireless, whereas the Germans used wireless successfully. One conclusion drawn was that flag signals were not a satisfactory way to control the fleet. Experience using lamps, particularly at night when issuing challenges to other ships, demonstrated this was an excellent way to advertise your precise location to an enemy, inviting a reply by gunfire. Recognition signals by lamp, once seen, could also easily be copied in future engagements.