> had my pulses been the opposite polarity to the ones I actually have, the NTP 
> software
> might have locked to the trailing edge of the pulse 200ms after the leading 
> edge, and
> rather than change that in hardware I could have set time1 to +0.200 (or 
> whatever) to
> get the correct time.

Flag 2 controls which edge of the pulse to use.  From the comments in
refclock_nmea.c:

 * If flag2 is set, it will use the clear edge of the pulse.

John

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