[time-nuts] GPS-18, Windows, NTP & Lat Lon

[Jim Lux]

On 9/3/13 5:35 PM, Jim Lux wrote:
> I'm looking for an easy way to get current lat lon, when you've got a
> GPS-18 hooked up for NTP.  That is, the GPS receiver is there doing it's
> NTP thing, so presumably it knows where it is.
>
>
> If NTP is decoding the GPRMC message, it has the lat/lon in it, so how
> can I get that info out (in a command line utility, into a file, or some
> such)
>
> I don't need millisecond time accuracy.. For now the GPS is just to make
> sure that the time is "right".
>
>
> The GPGGA sentence would also do.
>
> And, I only need the GPS position once within a 30 second interval (it's
> not moving, I just want to know where it is).
>
> It's not like ntpd or ntpq have some handy switch that says "display
> current lat/lon"  (which makes sense, because NTP is fundamentally time
> source agnostic).
>
> All of this with Windows 7.
>


I suppose one way is to turn off NTP (releasing the com port), grab some 
data from the com port, parse it, then turn NTP back on.

But that seems mighty clunky...

I was hoping for some log file/debug feature that says "give me the last 
sentence from the GPS".