There is a certain book series, that I'll leave nameless so I can talk about it without spoilers, that a group of people are told they are special. So special, in fact, that they can speak to Gods, but to do so they are compulsed (by said Gods) to perform certain rituals.
Well, it turns out that those people just have plain old Schizophrenia with the added bonus of OCD. It was a government conspiracy/experiment/etc.
It would be amusing if something along those lines was true with the Dunyain/Earwa. Certainly not everything, but some 'phenomenon' might just be explained by similar effects: the Dunyain have several different interacting strains of mental psychosis, such as described above.
I swore that it was said somewhere in the books the the Can't could take you to a specific spot if you knew the place. I tried finding that quote and couldn't. But, this when Serwa explains it to Sorweel, shows the immense difference in power between her and her father. I will see if I can find the other quote also, though I may be confusing it with the Cant of Calling.
The Cant of Translocation, she went on to explain, could take them only the space of horizon, less if her vision were obscured. The Cant’s difficulty was such that she could successfully hold its meaning only after at least two watches of sleep. She was lucky, she said, if she could complete two Translocations a day, unlike her divine father, who could cross endless leagues in that time, stepping from horizon to horizon.
The quote in TTT from Kellhus limits the Translocation distance to 1 horizon, either by directly seeing it as per usual, or to a place that is well studied. I think of it as 'seeing' it in the mind's eye.
I think on a clear day a normal person can see 2 miles to the horizon? Maybe its 5 miles. Not super relevant because of the above quote - 'endless' is a pretty large number of jumps.
Also, for the sake of funs, the distance to the horizon is limited both by the curvature of the Earth and the atmosphere. At large enough distances the atmosphere just gets in the way of the light and you can't see any farther. But, wait, often Kellhus is seen translocating from way up in the air. Why might that be? As it turns out, there is less atmosphere getting in the way, and at enough height you can see more fully the curvature of the world. From a space station, you could make a complete circuit around the world in ~4 jumps.
Granted, there's no air in space(!), and for other obvious reasons (vaccum, temperature, radiation, etc.), he can't go that high up, but presumably, he could go pretty damn high, and lengthen the single horizon jump length to pretty extraordinary distances.
FYI, I subscribe to none of that, just an explanation for those that need reasons.