The watch has a pressure sensor built in that is used by the AB solver, however, we don't pull the temp data from the watch into the solver as there are a lot of conditions where it could be inaccurate. You're wearing it on your wrist which will cause it to shift slightly, but if you're outdoors in cold weather but the watch is under a coat sleeve it can be off dramatically. The watch is able to pair with a Tempe sensor which is a wireless sensor roughly the size of a thick quarter or with an AB capable Kestrel weather meter. Otherwise you'll need to enter the temperature manually regardless of whether auto-update is on or not.
