The Navigator worked well for my wife and I. We arrived early at the main entrance of the terminal and were provided two wheelchairs as soon as debarkation from the previous cruise was complete. Check-in and boarding were effortless; they brought us to deck 11 for lunch as we were early and cabin was not ready. After lunch we went up to deck 14 (Cosmopolitan Lounge) and watched the football playoffs with a packed crowd of fellow cruisers.
When we got to our cabin our rented mobility scooters were there, fully charged. We rented from CareVacations.com, one of the two companies referred by Royal Caribbean. There was plenty of room in our accessible cabin (7600). The scooters were life-savers as the ship is large and we could not walk from one end to the other without a lot of pain (arthritis, bad knees, back). There was also room in the elevators for both scooters plus 4-6 standing passengers. We just needed to be careful backing out.
The scooters were no problem at the ports. We used the normal ramp. And the port where tenders were used also posed no difficulty--I rode the scooter right onto the tender.
This is designated as a handicapped accessible room. It is much larger but is the same price. The extra room is needed for wheelchair and scooter storage. Only 2 electric outlets but they provided a long extension cord for our CPAPs to plug-in at bedside. I brought a couple of multiple-outlet plugs with me and glad of it since at night we were charging two scooters, two phones, an iPad, and running two CPAPs all at the same time. bathroom was great--lots of grab bars, hand-held shower, seat in the shower, etc.