> Maybe you will end up with a resonator? Or is there some way you can use a
> PIC on its internal oscillator?

Resonators are a poor second due to accuracy. Internal RC isn't workable.

> Seems to me that whatever you are doing is
> going to have a short data collection time, so syncing things up at power on
> shouldn't be too bad.

Don't try to pull too much from the "details" I've given. :)
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