I have a question regarding the example on page A12, top left corner. The example shows a level one obstacle on a level one hill (I3). It shows H2 as a blind hex on a level one hill, but is measured 2 hexes away on a level two hill (J4).
J4 is a level 3 hill, not a level 2 hill.
Since J4 is equal to the level of the obstacle in I3, shouldn't H2 be visible?
As above, J4 is level 3, thus it's higher than the obstacle in I3. If it were equal, then none of the level 1 hexes would be visible at all. You have to be higher than the obstacle to see over it, regardless of how the blind hexes work out otherwise. And, as Devon said, all "real" obstacles (i.e. not just crestlines) always cast at least a single blind.