Casio Atomic Watch - problem for IFR?

S

sayagain

New Member
Anyone know if the Atomic signal interferes with any NAV equipment? And further, if Atomic watches are approved for use while IFR?
 
I wouldn't worry about it personally.

I've got an atomic travel clock I use on layovers and lots of guys have atomic wrist watches.
 
The atomic signal is received, not transmitted. It's passing through the airplane whether you have a watch that uses it or not.

However, some aliens use those watches to track people, so you might want to invest in a tinfoil hat if you do buy that watch.
 
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Anyone know if the Atomic signal interferes with any NAV equipment? And further, if Atomic watches are approved for use while IFR?

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Interesting you should ask...

I was in flight at FL310 about a month ago with my casio atomic watch. It was about 1:30 am (it updates at 1 am automatically) and the watch said 3:45. It was all screwed up. I had to ask ATC what time it was. I don't wear it flying early in the morning anymore. During the day it works great. Don't know what happened that night.
 
Those watches use the NIST time signal broadcast on 5000 and 10000kHz, which are in the shortwave spectrum. Other countries also use this frequency for their time signals, so you may have received a time signal from overseas. Late night just before dawn is when shortwave signals travel the farthest, and your altitude may be a factor.
 
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