By 14:00 on 30 May, the wind was still too strong and the final decision was made to use the alternative plan. The coded signal "31 May G.G.2490" was transmitted to the ships of the fleet to inform them the Skagerrak attack would start on 31 May. The pre-arranged signal to the waiting submarines was transmitted throughout the day from the E-Dienst radio station at Brugge, and the U-boat tender "Arcona" anchored at Emden. Only two of the waiting submarines, "U-66" and "U-32", received the order.