Martin Gregorie wrote:

> Andy Burns wrote:
>
>> But every satellite sends a NAV message every 30 seconds, receive just
>> one of those and you know the TOW (time of week)
>>
> I'm far from certain that I've ever seen anything like that trickling out
> of the serial port of a Garmin[...]

No, I don't say it's spat out as NMEA sentences, it might be available
in some of the chip-level GPS devices e.g. ublox seems to make TOW data
available.

> so my guess is that its used internally by the receiver and never output
> as an NMEA message. As I said, the only time and date message listed is
> ZDA, which contains UTC, day, month, year and local time zone

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