Instituto Brasileiro de Geografia e Estatística

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RBMC - Brazilian Network for Continuous Monitoring of the GNSS Systems


RBMC-IP is a real-time positioning service for users who employ the RTK (Real-Time Kinematic ) or the DGPS (Differential GPS ) techniques in surveys. Data are made available via the Internet protocol known as Networked Transport of RTCM via Internet Protocol (NTRIP), in RTCM format. NTRIP was projected to disseminate differential data correction or other types of GNSS data to users, moving or still, by the Internet. It allows simultaneous connections from PCs, Laptops and PDAs that have access to the wireless Internet, such as, for example, GPRS or 3G modem.

Data transmission is achieved by the following procedure: a GNSS receiver sends RTMC messages continuously to a “caster” server located in IBGE. Users, with a “client” application, such as GNSS Internet Radio or BNC (BKG NTRIP Client) and with an Internet connection, connect to the IBGE’s server and choose the RBMC-IP station(s) they want to receive data or differential corrections from. Finally, the corrected positions are obtained as the corrections are received by the users’ GPS (rover) through a standard serial port. Presently, the IBGE’s “caster” server receives data from 26 stations located in the main capitals of the Brazilian states:

Belém (BELE), Belo Horizonte (MGBH), Boa Vista (BOAV), Brasília (BRAZ), Campo Grande (MSCG), Cuiabá (CUIB), Curitiba (UFPR), Fortaleza (CEEU), Macapá (MAPA), Manaus (NAUS), Natal (RNNA), Recife (RECF), Rio Branco (RIOB), Porto Alegre (POAL), Porto Velho (POVE), Presidente Prudente (PPTE), Salvador (SAVO), São Luis (SALU), Santa Maria (SMAR), São Paulo (POLI), Rio de Janeiro (ONRJ e RIOD), Palmas (TOPL), Vitória (CEFE), Imbituba (IMBT) and Campos de Goytacazes (RJCG).

This server can be accessed by the IP address on port 2101. The 2101 port is reserved to transmit the differential corrections obtained by the NTRIP client. Accessing via any Internet navigator, it is possible to visualize the information about the stations.

The access to IBGE’s server is for free, however users need to fill out the register application and register as users of the service. The application will be evaluated and an user ID and password will be sent by e-mail. Some access restrictions are necessary in order to avoid traffic congestion in this server:

  1. Access to only three stations per user will be allowed;
  2. User ID and password will be valid for a maximum period of three months;
  3. Up to the maximum of 50 simultaneous accesses to the service will be allowed.

The "client" programs to be installed in the users’ computer or PDA can be found in the Windows, Linux and Windows CE platforms at the following address:; on the option "Project Selection" select NTRIP and click on "GO".

Users’ microcomputer cannot be inserted in a Firewalls network or Proxy otherwise the RBMC-IP service will not work. There are several commercial GNSS receivers that allow the access to the Internet via the NTRIP protocol. Further information can be obtained with the equipment representatives.

Further information about NTRIP can be found at:


Access renewal

Fill out the form to renew access if you have already registered:

Login: Password: (I have forgotten my password)



Station Location

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