Captain Errdo is a Gnome pilot stationed at the top of the Grand Tree (Ta Quir Priw). A player may ride on his gnome glider to any of the other destinations.
He also can be found at two crashed gliders. Captain Errdo will teleport you to the one east of Varrock (Lemanto Andra) but not to the one on Karamja west of the Shipyard's gate. You cannot ask him to take you to the Grand Tree from either of the two gliders due to the gliders being wrecked.
He is also an easy customer of the Gnome Restaurant minigame, but he will only reward the player with coins and no other tips.