What are the different correction formats & Mountpoints that you offer?

SmartNet North America supports a wide variety of correction formats to make sure we live up to 'Open to All'.  RTCM 3.2 MSM iMAX is our recommend Mountpoint for users running GNSS enabled equipment as it offers the most up-to-date features & constellations.  Below you will find details on correction formats and much more.

Summary of Correction Formats

  • RTCM 3.2 iMAX, ViRS, Nearest (Full GNSS)
  • RTCM 3.1 MAC, iMAX, ViRS, Nearest (GPS & GLONASS)
  • RTCM 2.3 iMAX DGPS, Nearest DGPS (GPS Only)

Understand the Connection & Configuration Page

On our Connection & Configuration Page, you will see a table section for the port number, Mountpoint name, Correction Type, Reference Frame & Epoch.  Each of these sections is critical to understanding what you are receiving on your rover & the different 'effects' of each.



Denotes the TCP/IP Port that needs to be input into your device to access the particular Mountpoint at the specified NTRIP Server Address


Denotes the NTRIP Mountpoint that needs to be input into your device to access the particular Correction Type you require for your application

Reference Frame

Denotes the Reference Frame that the Mountpoint is referenced


Denotes the Epoch to which the Reference Frame is tied

Understanding RTCM Message Types

Below you will see information on each message type that we offer and the type of correction formats they support, along with the particular Mountpoints that service these correction formats.  In addition, we offer a number of special Mountpoints to service our Multiple Reference Frame areas.

Message Types Compatible Constellations
RTCM 2.3 GPS Only
RTCM 3.2 GPS (including L5)+GLO+GAL+BDS


For more information about RTCM message types, please refer to the following - LINK

Understanding Correction Formats

SmartNet offers a wide range of correction types to support all rovers & applications.  Below is a description of the correction formats that we support, along with message type(s) used for each format. 

Correction Type Supported Message Type(s) Correction Description
DGPS RTCM 2.3 (Type 9,2) Standard code only correction for DGPS applications needing only decimeter level solution
iMAX RTCM 2.3, RTCM 3.1, RTCM 3.2 Individualized Master Auxillary Correction, uses a real reference station as the source for the network corrections so there is consistency and traceability for the corrections received by the rover
MAC RTCM 3.1 Master Auxillary Correction, internationally standardized Network RTK Method.  Gives the rover the control to calculate distance dependent error corrections itself, meaning the rover can adapt its calculations as it determines necessary (local environmental changes)
Nearest RTCM 3.1, RTCM 3.2 Nearest Station, single baseline correction for nearest reference station, does not apply network corrections or mitigate distance dependant errors 
ViRS RTCM 3.1, RTCM 3.2 Virtual Reference Station, represents the network to the rover as a single reference station with a short baseline length.  Limits the ability of the rover to do quality and integrity monitoring


Understanding SmartNet Mountpoints

SmartNet offers a wide range of Mountpoints to support all rovers & applications.  Below is a description of the Mountpoints that we support along with details about the particular Mountpoint.  

To determine the best correction format & Mountpoint for your particular rover, please visit our Connections & Configurations page.  These will contain the appropriate Mountpoint details, as well as Quick Guides for your particular rover. These Quick Guides contain all the information you will need to get connected to SmartNet including a section at the beginning that details the firmware & software versions needed for your particular equipment.

In an attempt to narrow the choices for our customers, we show a set of 'Recommended Mountpoints' and a set of 'Additional Mountpoints' tailored for your specific rover & your selected Corrections Area.  This curated selection of Mountpoints does not represent all the Mountpoints available, simply our recommended options.  For a complete listing of Mountpoints available in your Correction Area you will need to access the SourceTable and pull a complete listing of Mountpoints via your Rover interface.

Not all SmartNet license types have access to all Mountpoints based on price and market segment.  For example, a 1 yr SmartNet DGNSS Nationwide (decimeter accuracy) only has access to our DGPS Mountpoints, while a 1 yr SmartNet NRTK State / Sub-Region / Province has access to our standard Mountpoints (not including 'optimized' Mountpoints).


MountPoint Name MountPoint Description Correction Type

iMAX Solution optimized for iCON Series Machine Control

GPS+GLO (Network)

iMAX GNSS Solution optimized for iCON Series Machine Control

GNSS (Network)

iMAX Solution optimized for Powerbox Series Machine Control

GPS+GLO (Network)

iMAX RTCM v3.2 (MSM 4)

GNSS (Network)
MSM_NEAR RTCM v3.2 (MSM 4) Nearest Station

GNSS (Single Base)


VIRS RTCM v3.2 (MSM 4)

GNSS (Network)

iMAX RTCM v2.3 (Type 9,2) 

DGPS - GPS Only (Network)

RTCM v2.3 (Type 9,2) Nearest Station

DGPS - GPS Only (Single Base)

iMAX RTCM v 3.x (Type 1004)

GPS+GLO (Network)

MAX RTCM v 3.x (Type 1004,1015,1016)

GPS+GLO (Network)

RTCM v 3.x (Type 1004) Nearest Station

GPS+GLO (Single Base)

ViRS RTCM v 3.x (Type 1004)

GPS+GLO (Network)

iMAX Solution optimized for Zeno Series GNSS

GPS+GLO (Network)

iMAX GNSS Solution optimized for Zeno Series GNSS

GNSS (Network)

Nearest Solution optimized for Zeno Series GNSS

GPS+GLO (Network)


For additional information about SmartNet GNSS Correction Services, please watch our Summer Update & GNSS Launch Webinar - LINK

For even more details on SmartNet Mountpoints, please refer to the following knowledge base article - LINK

Understanding Multiple Reference Frame Mountpoints

SmartNet Mountpoints are typically referenced to the Current Reference Frame & Epoch for the particular correction area in which you are working.  For the US this is typically NAD83(NA2011) Epoch 2010.00 & in Canada this is typically NAD83(CSRS) Epoch 2010.00.  However, in California, Washington & Oregon the current reference frame & epoch can be updated to accommodate the shifts caused by tectonic plate movement.

To address these changes, as well as handle special legal requirements in British Columbia, SmartNet also offers Mountpoints that operate in different Reference Frames & Epochs.

For more information about these Mountpoints, please refer to the following knowledge base article - LINK


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