try these sites this is how i found all of my skulls and the terminals
http://halo3skulls.blogspot.com/
http://flamesoffeenix.wordpress.com/...nal-locations/
http://www.halo3planet.com/halo-3-skull-locations/
The famine skull is a pain as i suck at grenade jumping
The IWHBYD silver skull is a pain in the @$$ took me about 13 min