Although the graphics appear to be better in general (and print MUCH better than the previous .PDF), I'm really surprised about some of the content changes.

For instance, they no longer cover hypoxia or motion sickness at all. And several terms are used before they are defined. Using terms before they are defined is common in technical literature, but the GFH does it more often than other similar handbooks. The GFH has the feel of a handbook written by people who are a bit too far "inside the bubble" to know how to explain concepts to people outside the bubble.

Still, I'm glad there is finally an update. The 2013 version appears to be better overall than the 2003 version. Some progress is better than none.

Cheers,
-Mark Rebuck