'rebroadcasting' signals that reached them at much lower amplitudes, sufficiently low that the phenomenon was not of practical importance, nor even of much significance. Some have argued that, since the Kido Butai contained a large number of possible receiving antennas, it is conceivable the task force did not break radio silence but was detected anyway. Such detection would not have helped the Americans track the Japanese fleet. A radio direction finder (DF or RDF) from that time period reported compass direction without reference to distance. (Moreover, it was common for the receiving stations to report erroneous reciprocal bearings.) To locate the source, a plotter needed two such detections taken from two separate stations to triangulate and find the target. If the target was moving, the detections must be close to one another in time. To plot the task force's course with certainty, at least four such detections must have been made in proper time-pairs, and the information analyzed in light of further information received by other means. This complex set of requirements did not occur; if the Kido Butai was detected, it was not tracked. The original records of Lurline surrendered to Lt. Cmdr. George W. Pease, 14th Naval District in Honolulu, have disappeared. Neither Lurlines log, nor the reports to the Navy or Coast Guard by Grogan in Hawaii have been found. Thus no contemporaneously written evidence of what was recorded aboard Lurline is now available. Grogan commented on a signal source "moving" eastward in the North Pacific over several days as shown via "relative bearings" which then "bunched up" and stopped moving. However, the directions given by Grogan in a recreation of the logbook for the Matson Line were 18 and 44° off from known strike force positions and instead pointed towards Japan. According to author Jacobsen, Japanese commercial shipping vessels are the likely source. A re-discovered personal report written by Grogan after the radio log had been passed to the 13th Naval District, dated 10 December 1941 and titled "Record for Posterity", also does not support claims of Kido Butai broadcasting. Other alleged detections The contention that "low-powered" radio (such as VHF or what the U.S. Navy called TBS, or talk between ships), might have been used, and detected, is contradicted as impossible due to the tremendous distances involved and when contact was lost, it was routinely presumed it was because low-powered radio and land line were