Re: moving to 8 digits of lat/lon (gpxlogger, maybe elsewhere)?

[John Ackermann N8UR]

On 9/3/20 3:06 PM, Greg Troxel wrote:
> "Gary E. Miller" <gem@rellim.com> writes:
>
> > Yo Greg!
> >
> > On Thu, 03 Sep 2020 14:48:03 -0400
> > Greg Troxel <gdt@lexort.com> wrote:
> >
> > > I newly have an F9P, and have gotten it to work in RTK mode with the
> > > MaCORS ntrip server, just by adding the ntrip:// URL with a mountpoint
> > > for MSM, single base, specific station sort of nearby.  At least, the
> > > "no RTK" light goes out, and the position wander as seen in josm
> > > pointing to gpsd is very small, less than 1m p-p over a few hours,
> > > indoors.
> >
> > Cool.  I have not had such luck with NTRIP a mile away...

FWIW, a couple of days ago I took an F9P with the Lefebure NTRIP caster 
software and the Ohio DOT VRS network out into the field to spot a bunch 
of antenna tower locations.  Data captures of around 80 - 120 seconds 
show CEP(95%) of a few millimeters when there's an RTK FIX solution.

I'm using the u-blox ANN-MB-00-00 dual-freq mag mount antenna, which 
seems a bit touchy.  It absolutely wants a ground plane (I'm using a 
metal pie tin) and the solution often dropped to float when there were 
sky obstructions.  (But I think the receiver may have been left in 
GPS-only mode; turning GLONASS on would probably help with that by 
making more SVs available.)

I was impressed with how well my lashed-together portable surveying 
experiment worked, and I'm in favor of going to %.9f to fully exploit 
the F9 receiver capabilities.

John