On 23 August, north of Guadalcanal, Rear Admiral Tanaka's convoy was spotted by a PBY Catalina flying boat. At 0830, Tanaka received a signal from Vice Admiral Gunichi Mikawa's Eighth Fleet headquarters directing him to head north to avoid the American task force. At 1430, Tanaka received a signal from Vice Admiral Tsukahara's 11th Air Fleet headquarters directing him to land troops on Guadalcanal the next day. Tanaka, faced with yet a second set of conflicting orders, replied that he could not comply because some of his ships were too slow