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In general, you can bring a watch but not a phone in some areas. An aviation friendly watch does a nice job of being visible (bonus visible in the dark) as a watch. Bonus as a timer. Extra bonus if it can give you zulu time with current time, as that is asked frequently.

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If it's going into a secure facility it doesn't matter if it's a phone, an iwatch or a garmin, if it has a radio and/or nonvolatile memory, it's not going in.

Interesting. So would a mechanical watch be ok, but an electronic one not ok?

An electronic watch is ok. Just not with cellular, wireless or bluetooth, USB capabilities.

How would you tell? Assuming someone's being sneaky, that is.

WIDS or some other spectrum monitoring; or random physical checks. But mostly policy controls and background checks.

You can be sneaky sure, but that what background checks are for - to see if you are a trustworthy individual.

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