I'm a mac user and have been using bootcamp and Windows 7 so I can use the Windows version of Mission Planner. Somewhere recently, I saw a post that had a link to a beta version of the Mac OSX AP Planner. I downloaded that and it seemed to work decent for me. It had a slightly different look, as expected, but it sure was nice not having to load Bootcamp.
The reason for the post is that I believe I uncovered an issue when trying to calibrate the compass on my Y6 using the Mac OSX version of Mission Planner. I probably tried 6-10 times just as was shown on the several instructional videos, but I kept getting that the 'offsets were too high'. I finally gave up and thought that I was doing something wrong, so I just put it away. The next night, I decided to use the Windows version of Mission Planner and did the exact same process as before. It worked perfectly on the first try. I just thought I'd throw it out there in case someone else has experienced the same minor issue.