I'm not sure if you will get a specified seating area. Generally the cruise lines accommodate your seating time and not where you want to sit. I've sailed with my 22 month old four times now (NCL, Royal Caribbean, Disney and HAL) and no one seemed too bothered when we had to take him out for walks or because he was crying. Most of the dining rooms are big and full of noise anyway!
Let me know how you like the Navigator.
Luisa Frey Gaynor
Family Cruise Editor