ONE PIECE Episode 149: Steer for the Clouds! Capture the South Bird!
Episode 149 of 1180 of ONE PIECE, aired March 23, 2003, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Cricket explains how the Straw Hats can ride a dangerous vertical current called the Knock-Up Stream to get to Skypeia. However, they first have to catch a southbird to point them toward the point where the stream will erupt from the ocean.