Hi, my oldest son, and my dh are hearing impaired (bilateral) DS went to a total communication school - he learned Signing Exact English, and does well with his hearing aides, and closed caption -
Get familiar with the links listed for Hearing Impaired (Talking Hands here, and others, including myself) have posted experiences...
1. Reflective Captioning - (
http://allearsnet.com/pl/reflect.htm ) if your 7yr old doesnt use Closed Captioning at home, he probably wont use Ref Cap at the parks... for the 3D movies, and other movis (Hall of Presidents) they use reflective captioning, its wonderful - dh for the first time was able to 'understand' Donald Duck (MK Philharmagic) in Animal Kingdom, and Epcot the 3D movies you line up and request the reflective mirror, but not all CM's were familiar with this - esp at AK they wanted us to sit with the wheelchair people, but you cant get the captioning from back there - when you walk in the theatre look at the back of the room for red scrolling messages - thats the reflective part!! we usually sit halfway down on the end to capture the words on the mirror.
2. You can put a deposit down to get the devices that are similar to the FM, you need to check them out, they are heavy, and I'd have to here it is
http://allearsnet.com/pl/listen.htm
its the Assistive LIstening Device, this one isnt heavy, but I have a back pack I kept them in to hand them over when he could use them, but halfway thru the ear plug wire got fuzzy so he stopped using it
3. Hand Held Captioning Device > >
http://allearsnet.com/pl/handheld.htm
again, you put a deposit and use it at certain attractions, and if your 7yr old doesnt use closed caption at home, he may not benifet from this, this is the one we thought was heavy... and it was off at MGM one of the Backlot Tours had changed, and they hadnt updated the captioning...
Just know most of Disney is captured through all of our senses, so much to see, and experience, and feel - he'll have a grand time!!
We didnt have need of the GAC, for sitting close to front as we did use FP and just verbally told the CM's we needed the Reflective Captioning, it was never a problem...