NMEA but no PPS in ntp, Ubuntu 18.04.5

[Steve Bourland]

Yo Gary!
  Attached should be a few seconds of output from:

# ./gpsd -N -n -D 6 /dev/ttyS0 |& fgrep -e PPS -e GPGSA

With:
# ./gpsd -V
./gpsd: 3.21.1~dev (revision 3.21.1~dev-2020-12-03T20:16:20)

Included the GPGSA lines to show that the device thinks it has a 3D lock 
(not sure if that's the line cgps/gpsd uses to make a determination, but 
guessing it is?), but PPS doesn't for some reason.  You've indicated it is 
going to be hard to troubleshoot remotely, happy to hack the code for you 
here or pull as many heads (lord that sounds bad) as you need to help 
figure this out.  This is obviously a bit on the important side for me.
                                        Thanks,
                                          Steve

temp.txt
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