Not achieving Fix on Facet L-Band using NTRIP

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1

Hello,

I own a Facet L-Band unit which has been working great in my property survey.

After the demise of the pointperfect correction service, I have been trying to use an NTRIP source to get a fix. I am using the CRTN (managed by UCSD) service through SWMaps.

CRTN sends RTCM3.3 data.

The connection is OK and the unit shows that it downloads data. However, a fix is never achieved. The base station is close-by.

I also tried to use the built-in NTRIP client using Wifi, which also seems to connect but with the same result (no fix).

Do you have any idea on what my problem could be?

I am running FW 4.4 and Ublox HPG1.32.

Thank you!
Martin

2

Looking further into the RTCM3 stream I get by using SNIP, it seems like messages 1005 and 1006 are never sent. I do receive messages 1013, 1029, 1077, 1087, 1097, 1127 and 1230.

Could be the cause of my problem? I believe it is…

M-

3

What is the name of the mountpoint you connect to ?
There are many hardware specific versions that are not compatible.

4

P198_RTCM3

5

It is listed as RTCM3.3.

6

hmmm… this is strange.
Could you try another station just as a check, even if it’s not close enough to be useful ?

7

@wildcattle, I took a peak at the CRTN site. It appears to use MSM7 messages. They may have chosen to not bundle the 1005 message into the MSM7 stream.

There is a quick way to test, by trying the 3.1 stream. It’s not MSM, but will include the station messages :

News 10/22/2025: RTCM3.1 streams are now available for users with legacy equipment. To access an RTCM3.1 stream just change the mountpoint to XXXX_RTCM3P1 instead of XXXX_RTCM3, where XXXX is the station code. Everything else is the same.

I guess it’s worth a try…?
Mountpoint: P198_RTCM3P1

Note: the 3.1 stream will only be GPS + GLONASS :grimacing:

I do know that previous Sparkfun users have operated RTK with the CRTN NTRIP in the past. But maybe not since the recent changes (August 2025) ?

The F9P inside the Facet L-Band can consume MSM7 over NTRIP, but the station information is required, apparently.

8

I tried p188 on SNIP and it is the same thing: no 1005/1006…

Also _RTCM3P1 did not improve anything.

Thank you for the help!

M-

9

Hi Martin ( @wildcattle ),

Please check that you are sending your location to the NTRIP Service. In SW Maps (NTRIP Client), it is “Send NMEA GGA to Base Station”. In RTK Everywhere, it is “14) Toggle sending GGA Location to Caster” / “Transmit GGA to Caster”.

I hope this helps,
Paul

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10

I just tried that and it is still stuck in DGPS.

I see on the unit display that data is flowing by (down arrow).

I though this was needed for the NTRIP caster to figure out which mount point to use (But what do I know??? ).

Anyways, no dice…

I have an email out to CRTN, but it is a holiday today.

Thanks for the help, though

M-

11

I hate to even ask…but you are trying outside and the Facet has a good view of open sky, correct ?

12

sure, and I also tried with the RTX express I have. Same story.

I am at 0.29m error in DGPS. Should be plenty good enough.

The lack of 1005/1006 is likely the problem. The CRTN info says it should provide 1006.

M-

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13

I just looked at the status map for your Station.
It appears to require a different port for the various RTCM versions.

image
image333Ă—942 14.7 KB

Might be worth a try. Good Luck !

14

Yes, got that right: 2102 it is.

I do get plenty of message per SNIP, but no 1006.

It appears that this actually comes from earthscope, maybe there is a way to reach it directly?

15

Maybe so ?

CTRN is different than any of the other States’ Free Networks that I’ve seen…(CA) Go figure?

I’m still fairly confident that you and the forum will get it sorted out. Manually entering station coordinates can’t be what CRTN had in mind.

Or it’s something squirrly like: A free NTRIP account comes with everything BUT the station message…LoL.

16

I actually managed to get an account on Earthscope which is the source for this station, but sadly, there is still no 1005/6 reported by SNIP. So still no solution. Hopefully, the lady at CRTN will respond to me.

17

I’m just answering out of curiosity
It seems like “198” often goes offline on the CRTN caster port 2102 but online on Earthscope port 2101
and this is the stream

immagine
immagine1263Ă—358 121 KB

18

Wait… that screenshot is showing 1005 on station P198, correct ?

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19

Indeed 1005 (earthscope) and 1006 (CRTN) finally showed up.

A fix is now achieved ! :grinning_face:

I suppose my email to CRTN got things in motion.

Thanks to everyone for their support and help…

M-

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