A familiar grants special abilities to its master, as given on the table below. These special abilities apply only when the master and familiar are within 1 mile of each other.
The "table below" happens to be the Special Ability table showing which skill bonuses you get per familiar type.
Does this mean your familiar going beyond 1 mile only removes that specific skill bonus? What about the other level-dependant special abilities such as Alertness, Empathic Link, etc...?
Also, quick side question: Ravens being able to speak one language is among the skill bonuses table. I suppose it means they cannot speak said language if they go beyond 1 mile of their master?
EDIT: I just noticed Empathic Link specifically mentions it only goes up to 1 mile. Since it's the only ability where it's specified, I'm guessing it means it is not a usual limitation. If no one disagrees or posts an answer that goes in that sense, I'll post one myself sometime later.