Is there something that affects negatively routing on the other side of the globe?

I mean, I tried to pick the farthest away place, so I could theoretically route at home, if I'd know where I'd be going, and then look at the route map, so that it'd download tiles at home. So then, when you're abroad, you don't have to access the web, at least to download tiles...

So, I can do this now, for instance picking two points in Prague, as I'm not there, it routes great.

Then, I tried to do the same for Hawaii, it tries to get the results from google, says it's 12000 km away, but then it just never calculates the route... Left it for a couple of minutes, and every time I touch the display it says it's getting the route details...

Is there maybe some glitch, as it says 12000 km, which it shouldn't, should it, so that it's still maybe somehow calculating how to start the navigation from the closest position, and that being in Russia, 12000 km away, takes forever?