Cruisecrazy, don't quite what you mean about Royal Viking and what the "no comparison" is with Radisson, having never sailed that line. Anyway, it no longer exists. I was on a leg of the 2005 World Cruise with a lot of former RVL cruisers, maybe you are one. However, having sailed all the RSSC ships, I can't say that the Navigator is "only" a 5 star, wondering what the Mariner and Voyager are in your mind. The cabins on the Navigator are the same size as the Voyager, larger slightly than the Mariner. The main differences in the standard cabins on the Voyager and Navigator are exactly the same, whereas on the Mariner, they are ever so slightly narrower, and the bathroom on the Mariner has a tub/shower combo in most cabins.