Stepping into the padded vault felt like entering some kind of portal. The sterile white room was lined with jagged, pyramid-shaped foam spires; a cross between a recording studio and some kind of icicle torture chamber straight out of Elsa’s castle from the movie Frozen. I glanced down at my phone: no bars. Deep inside Apple’s testing labs, I was officially off the grid.
From Wi-Fi and GPS to Bluetooth and GNSS, and now 5G and satellite connectivity on the Apple Watch Ultra 3, a constant stream of wireless signals moves in and out of the watch, making it tick. The antennas and hardware have to be seamlessly woven into the very fabric of the device from the earliest design phase — out of sight and out of mind — then tested in real-world scenarios to make sure nothing interferes with the signals going in or out (not even your arm).
This is what Apple calls a radio anechoic chamber: a completely radio-silent environment that blocks outside signals. In the center was an Apple Watch Series 11 on a black arm-shaped mount, mimicking how the human body might interfere with signals. A rotating black antenna ring circled the chamber, measuring how well the watch’s own antennas were sending signals across different cellular and Wi-Fi bands. Once sealed, the chamber is designed to remove any outside interference.
Going off the grid: GNSS chamber
The final chamber, tucked away on the basement level, was the largest of the three. As soon as I stepped into the massive room, I watched the cellular bars on my phone start to drop until they disappeared completely when I reached the center. This was the 15-by-15-meter Global Navigation Satellite System simulation room, which can trick a watch into thinking it’s anywhere in the world. Today, I had been transported somewhere deep inside Alaska’s Denali National Park.
In the middle, an Apple Watch Ultra 3 sat on a black mock-arm mount, showing the exact off-the-grid made-up point on a map. The room can re-create the exact satellite geometry of any place on Earth, allowing Apple to test how accurately the watch can pinpoint your position. That kind of precision is critical for emergency SOS via satellite, but it also enables non-emergency features like sharing your location through Find My when you’re off the grid.
Leave a Reply