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

From: John Ackermann N8UR
Subject: Re: moving to 8 digits of lat/lon (gpxlogger, maybe elsewhere)?
Date: Thu, 3 Sep 2020 15:21:34 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0

On 9/3/20 3:06 PM, Greg Troxel wrote:

"Gary E. Miller" <> writes:

Yo Greg!

On Thu, 03 Sep 2020 14:48:03 -0400
Greg Troxel <> 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,

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.


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