By 04:00 on 23 May, Lütjens ordered Bismarck and Prinz Eugen to increase speed to 27 knots (50 km/h; 31 mph) to make the dash through the Denmark Strait.[47] Upon entering the Strait, both ships activated their FuMO radar detection equipment sets.[48] Bismarck led Prinz Eugen by about 700 m (770 yd); mist reduced visibility to 3,000 to 4,000 m (3,300 to 4,400 yd).