Disney already tracks you with the current KTTW card. If you use for everything possible it knows.
- When you open your door
- When you get a FP
- When, where and what you ate for meals
- When, where and what you buy anytime you charge it back to your room
The difference is these things require you the person to physically do something, which is use your card or have it swiped for you. With RFID they can track you even if you don't buy a single thing int he park. Now I doubt they'll give specifics of the technology they are using, but I know with the Enhanced Drivers Licenses (EDL) that DHS pushed aggressively for they have quite the long range RFID in them, I've read some stories that say up to 50 meters away you can read them, even if that number is on the far end there's not too far you can get away from the side of a road where an RFID reader might be actively scanning so you can bet there's no place you can "hide" by being out of range in a Disney park.
Now I can definitely see some positives to being able to track this sort of thing, basically Disney can track traffic patterns on the walk ways, in lines, when parades start, finish, I mean the amount of data you can get from tracking individuals is staggering, hell maybe even wait times will be more accurate, rather than every so often giving someone a red card to hang onto through the line, now every is that "red card". Also if there is a unique identifier in each tag this could be quite useful for lost kids, "Help I lost my child" "no problem lets just verify you are the parent, ok good.... *types some keys* he's over by dumbo"
Now of course there's always the tinfoil hat people who don't like being tracked, and I'll admit I'm one of those people as well. However I really don't think there's any Machiavallian schemes going on here. In fact could be quite the opposite where as you walk by a screen or something perhaps a unique "ad" or "message" gets played for you. And if there's any LED lights on it they could flash to some pattern during a show or something, like they do at DLCA with their flashing Mickey Ears that have RFID in them for the World of Color show.
Now one thing that I haven't seen addressed is why there is a battery and is there an active transmitter. Maybe someone with better electronics knowledge can look over the documents. Though the document asks Confidentiality so it may not be spelled out.
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This probably comes into play with the long range aspect of it, something to help boost signal strength or something of that like is my guess, for it to constantly send a signal out unless there's a transmitter that's requesting it would be silly and wasteful. I do predict a ton of Disney themed RFID receiving stations to be installed in every possible place in the park, side of roads, in lines, along rides, in restaurants, near parade routes, hell perhaps even in bathrooms (too many people going to the bathroom after all ate at a restaurant... good way to track any health issues with food). Disney is already known as one of the best in the world in moving large quantities of people, they're just going to get better by being able to arrange traffic even better too. Basically you see that bottleneck in that pathway? Hmm maybe we should move the churro cart elsewhere during the times of 4pm to 6pm, or what not.
Lots and lots of data for Disney that's what these RFID bracelets are going to be used primarily for, not for your experience, and not to make things "easier" for you. I don't honestly see how a card isn't easier, it fits nicely into a credit card compartment of my wallet, I am virtually guaranteed to never lose it, can't say the same for a bracelet that I don't want to wear so might stuff in my pocket or clip onto a belt strap, that introduces a large potential to "break" off or fall out of a pocket. I'm still going to have to scan my finger at the gate to make sure the bracelet is in fact me, I'm still going to have get held up in line getting into the parks not for tickets getting scanned but for all those geniuses who want to get creative with their finger scanning and can't remember which finger they used. Fastpasses might go quicker if lines for them are long, but I assume I'll still get a ticket so I can remember when it is. And best of all it's an added piece of remembering I'll have to do since I don't wear bracelets ... EVER... and have to remember to strap it on, where as my wallet I pocket every day when I leave the house so it's instinctual.