Virtual Reference Stations (Was Re: gpsprof: higher resolution)

[John Ackermann N8UR]

On 8/16/20 7:19 PM, Gary E. Miller wrote:

> > That's one reason why I'm interested in trying the ODOT reference
> > network in the hope that they will provide correctsions for GLONASS
> > as well as GPS.
>
> ODOT does GLONASS, but only in a "virtual" ntrip that gpsd does not
> understand and no one can show me what messages are required.

Just a follow-up information point:

I got a login to the Ohio DOT virtual reference station network, which 
uses the Trimble VRS system.  It appears the only unique requirement is 
that the rover needs to send an NMEA GGA sentence to provide an 
estimated location used to construct the virtual reference station 
location.  Other than that, the traffic flow is all outbound from the 
network to the rover.  (I don't know if it needs just a single GGA 
sentence at login, or at some interval.)

John