I'm trying to remember a book I can only remember the setting to but not the story.
I think there are two separate types of people on a planet, nomadic style people with their horses and the "not nomads". The planet was landed on long ago by people in a great ship or some such thing.
Since being cut off from humanity the people have technologically regressed to a typical fantasy type era. Some forms of "scrying" or "farseeing" with some kind of glass spheres actually uses some kind of satellite system in place, but the users of this don't realize what it is and think of it more as magic.
I think one of the two types of peoples wants to try and go home in the ancient "ship" to their real homeland over an ocean, but the characters end up finding out humankind really came from off world, not over the vast ocean, and the ship is a spaceship.
This is all I can remember. Thank you so much if you can remember this book!