Thanks Fred. Although we have not been in the 900 Navigator suites, we walked through deck 9 several times (it's the easiest way to go to the Gaileo lounge without going outside). I have mentioned that these suites are under the pool. The center of this section contains pool equipment and the pool chemicals. Several times we noticed the smell of chlorine in the hallways.
Some people have mentioned the noise from the pool area (above) during the day, the smell of smoke and/or food wafting down. This is why we chose 1125.
1125 is slightly smaller than the other Navigator suites. It is also newer. As Fred said, we enjoyed the suite very much!