[time-nuts] GPSDO - probably a stupid question.

[Mark Sims]

The Ublox modules (at least some of them) can support an external oscillator and have  messages for controlling oscillator parameters and disciplining.

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> This is actually done.  But you need to design the GPS receiver from the
ground up to use a very high quality oscillator.   The Thunderbolt is an
example of this.  It has a 10MHz OCXO used as the internal clock.