U-blox GNSS, what NMEA messages to enable just for time sync on linux?

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I'm recording raw output from an M8T on an SBC without an RTC, and would like to use GNSS for time sync. Chrony won't use the GNSS unless I enable NEMA messages, but I don't know what are the minimum required to get a time sync.

I want to keep the NEMA messages at minimum as to keep the GNSS log as small as possible.

Thanks!

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