“if there was one person I would put my absolute faith in to save us all it’d be John Locke” – Charlie, how fitting that is when you watch the latest trailer for Season 4…
Magnetic anomaly
The “malfunctioning” compass that Locke gives Sayid is the first mention of any magnetic anomaly. From what we find out by the end of season 2 we know that this anomaly can do much more than just give inaccurate compass readings.
The Donkey Wheel