Later research showed that Howland's position was misplaced on their chart by approximately five nautical miles. There is also some motion picture evidence to suggest that a belly antenna on their Electra might have snapped on takeoff (the purpose of this antenna has not been identified, however radio communications seemed normal as they climbed away from Lae). One relatively new theory suggests that Noonan may have made a mistake in navigation due to the flight's crossing of the International Date Line. However, this theory is based entirely on supposition and does not offer any evidence Noonan was impacted by or failed to adequately account for the 24 hour variance in his sun line calculations.