I Came across a glitch while playing Uncharted:GA, chapter 7 after taking the photo of the map. As soon as i took the photo the image appeared and I had to restart checkpoint to get out if it. I've looked into it and found that someone else has had this, I just thought I'd share it with everyone.
Rumour is it might have been an upcoming DLC. OR a part of the game that was scrapped at the last minute during development.