kb...@n1k.org said:
> The alternative is to plug a USB GPS into the mac and do a bit of code to
> compare things. If you want to pass the gizmo around to your friends …. that
> can be done. Pretty good ones are “sub $10” delivered.  

USB GPS gizmos generally don't have a PPS and the timing on the NMEA 
sentences is generally crappy.  (I may be biased by a few bad examples.)

Does anybody have a list of ones known to work well?

There is at least one GPS-USB with PPS, the Navisys GR-601W/GR-701W/GR-801W,  
They were hard to get retail.  Looks like idealez sells them Taiwan for $47 
for the 701W (Ublox 7), $50 for the 801W (Ublox 8) (plus shipping).  I 
haven't tried ordering through them.  Gary and/or Mark may have some for sale.

----------

Plan B is a GPS breakout and a USB-serial breakout and a few wires.  4x less 
USB jitter if your USB-Serial chip is full-speed.

I got mine from SparkFun:
Venus GPS with SMA Connector
  https://www.sparkfun.com/products/11058
USB to Serial Breakout - FT232RL
  https://www.sparkfun.com/products/12731

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Google found this.  I don't know anything more:
  https://www.zti-communications.com/z050-gps-dongle/


-- 
These are my opinions.  I hate spam.



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