Three days out on the venture, the first mate says, Everything's an equal share. That should mean the location of the treasure too, so Jack gives up the bearings.
11 seconds sound clip from the Pirates of the Caribbean 1: The Curse of the Black Pearl movie soundboard.
You can hear this line at 01:06:07 in the Blu-ray version of the movie.
Quote context
[...]
- That was before I met him, back when he was captain of the Black Pearl.
- What? He failed to mention that.
- He plays things closer to the vest now.
- And a hard-learned lesson it was.
- That night, there was a mutiny.
- They marooned Jack on an island and left him to die. But not before he'd gone mad with the heat.
- Ah... So that's the reason for all the...
- Reason's got nothing to do with it.
[...]