Community Forum

Accuracy m+ with rs+, position, setting


Hello everyone,

I have such a set connected (m+, rs+, Lora, Tallysman multi-GNSS antenna)

  1. How to refine the receipt of the coordinate correction reach the module m + to the base rs +, which receives corrections from the ground base station from Poland?

  2. How to set the m + module so that when lying on the basis it has been adjusted to point 0?

  3. How do you set the m + correction speed so that when it is moved it shows the right value immediately?

  4. What frequency should be set in the rs + database settings and the m + module? The default is 868 MHz. What setting up data transfer?

My settings:
Base Status:

Rover status:

Base RTK Settings:

Base Base Mode

Base Correction INPUT

M+ Correction input

M+ RTK settings

(Michael Lambert) #3

Hi @Adata,

  1. So you want to get corrections from a service to you base and then corrections from the base to the rover (M+)? I am not very familiar with correcting the base from another source because I always use a standalone base solution and the only instance I understand is using the service to correct the rover. I am sure you will get a better answer to this soon.
  2. How to physically set the M+ or what settings to use? You might take a look at this. It may answer some of the other questions below. Base and Rover Setup
  3. See the document above, but I don’t think there is much of a reason to run faster than 5Hz on a terrestrial survey unless you are mounted to a vehicle that is moving much faster than you are walking.
  4. 868MHz is a good start. I believe 864MHz. The lower the frequency the more stable the connection and penetration vs obstacles, but the higher the frequency the faster the communications. The only time I change frequencies is when I have tried everything else, but am still experiencing some kind of interference. Maybe another source on the same frequency… You might go through this thread. [https://electronics.stackexchange.com/questions/115429/900-mhz-vs-433-mhz-for-urban-environments](http://900MHz vs 433MHz). The same concept, but a much more appreciable difference.

I may be wrong, but on the images above I think they might be set reversed. Normally the gray bars indicate the corrections from the base and your rover status have only its satellites?

The base RTK settings look good, but I think 1Hz is recommended. This may be different in your case of receiving corrections from a service? The selection of satellite constellations is what you can play with if you are have trouble getting good satellite communications and problems maintaining a good RTK Fix.

Base Mode, turn the power up to around 16dBm and as you inquired before you can increase the Airdata rate. Coordinate accumulation for the initial base point should be 10 minutes or more. Again, this may be different with NTRIP.

Again, when you have problems with the RTK Fix I believe you can leave the base with the full constellation setup you find most stable and troubleshoot on the M+ (rover) until you stabilize. 5Mz looks good to me.

There’s some really sharp people on here so I look forward to corrections of my post and learning something myself! Good luck!


RS+ setup:

M+ setup:

And final

(Timd1971) #5


Just curious, and always wondered about the GLONASS AR MODE.

In this case, why is it OFF on BASE and ON on ROVER?


(Michael Lambert) #6

I thought AR should be on if you had the same base and rover? Maybe off for NTRIP?


Glonass AR can be ON with non reach base.
Edit: old habbit crapped on my leg. Corrected my statment.

(Timd1971) #8


In my case, Central USA. No NTRIP. Just BASE and ROVER (BOTH RS).

Should GLONASS AR MODE be on of off for both?


Should it be OFF if i want to use GPS/SBAS mostly? Is that the purpose? I dont quite understand GLONASS AR MODE function?

(Michael Lambert) #9

GLONASS AR is like a secondary form of corrections. I don’t exactly understand what it is cross-referencing and cancelling out, but this doc from Emlid confuses me though?


You could use glonass on.

It does matter. Glonass is in the calculation loop and can be either on or off.


i just noticed. I think its been there for a while. I just alway had it turned off because of old habbits.
I correct my self.

(Michael Lambert) #11

I am from the survey and now drone side so getting deep in this GNSS is a slow-but-sure process. :blush:

(Timd1971) #12

I hope @bide doesn’t mind, but he was helping me recently with this via PM. I still have a tough time understanding GLONASS AR MODE somewhat:

> Also, simply. What is GLONASS AR mode? Off or on? Does it help to have on when GLONASS sat selected its OFF by default i see. Using fix and hold.

Well you need around 5-6 decent satellites in ONE constellation to get a fix. With GPS, the SBAS ones count as well. I can’t speak for high latitudes or other continents though. So if you want your ambiguities solved by the GPS satellites then leave GLONASS AR off, and if you don’t care if the ambiguities are solved by GLONASS satellites or GPS satellites then leave GLONASS AR on. You can’t get a fix with some GPS and some GLONASS, it uses one or the other.


@bide mind is much higher rated then mine so i would thrust him over me. I think its because he work on Linux and i am still on windows computers :grinning:
But is your question if Reach utlize glonass AR with only GPS enabled? Then i guess Bide is right. I would thrust that.
If so i need to do more correction in my post above.

Note to self: Get my self up to speed before you speed everybody els of in the wrong direction. :grimacing:

(Timd1971) #14

Yes, unfortunately all of our minds combined still cannot compete… especially mine, as it would affect things negatively since at birth Coca-Cola was put in my bottles. ; ) ha!


Yeah, me too :rofl:
I am getting too old for this


Yes, you guys would have been better off with Jolt Cola or Red Bull I think.

(Michael Lambert) #17

Red Bull Slushes at Sonic!


(Timd1971) #18


You guys r a trip.

Ps. I remember Jolt.


I dont know about you guys, but i am pretty sure we are the only ones reading this thread and the TS going whaaaaaaaaat??

(Michael Lambert) #20

We should rename it to “mixology - accuracy of red bull and vodka”.


… and set post nr #14 as solved and close the thread.