Hi - awkward posting title - here's what I mean... I had seen someone allude to needing different (substitute) letters when inputting a name into , maybe GPS, cell phone ... they had gotten a "cheat sheet" from a kind guesthouse owner, but they did not post what those sub letters were. I imagine the letter prior to "Thingvellir" is used with -th. Others???? I hope I made some sort of sense!