Aside form the Almanac pages Darth Saber posted at the beginning of this thread there are only 19 pages shown.
I've been able to decipher most of the pages text accept a few words here and there.
The 2 pages I can't read are the page facing the torch and the page with the El Dorado map.
The El Dorado map appears to be in the middle of the book and the second to last page since you can see part of it when Nate shows Sully that the last page is missing.
I'm currently looking into any info on Drakes actual journey in the Pacific since the journal notes mainly deal with this.
Unfortunately his journals and charts where actually confiscated by the Queen and have been lost (or so they claim)
I did pick up a copy of his Almanac (quite expensive for such a tiny book) that many of the game pages use but they are out of sequence to the real one.
Scans of the book can be found on line.
The text on the pages describe Drakes journey and things he found (firefly's and bats) Taking of Spanish treasure ships and ports, etc... they also make reference to the person that made him the maps and drew the clues.
Interesting note: the person that supposedly made the map (last missing page) was a real person but was born 200 years later.