"Andrey Serbinenko" wrote in message
...
A question to the group. When I was going through my high-altitude
physiological training, they instructed us to remove wrist watches
before going for the baro-flight to FL250 (unpressurized). Has
anyone experienced any anomalies with wrist watches at low pressure?
I just can't think of why they'd require that. Even diver's watches
will hold the pressure up to a point and then the seals will leak
-- before any damage to the body of the watch or the crystal occurs.
Does the battery have any air inside that will blow it up?


Andrey



Dive watches are designed to keep water out not to keep air in. That said,
probably 999 out of 1000 wouldn't have a problem but since one probably
popped on them once they just made up a new rule. You know how much
organizations like rules.