GNSS RTK Surveying in Mexico: INEGI RGNA CORS Guide 2026

Mexico's survey sector is driven by three primary demand streams, each growing rapidly in 2026.

Infrastructure and nearshoring construction: Mexico has become the primary beneficiary of manufacturing supply chain diversification from Asia, with hundreds of industrial parks, logistics hubs, and factory complexes under construction across Nuevo León, Jalisco, Guanajuato, and the Bajío region. Each development requires precision GNSS survey for site layout, earthworks, utility infrastructure, and as-built documentation. Road and rail expansion — including the Tren Maya and NAICM-related infrastructure — adds large linear survey workloads across the southeast.

Oil and gas: Pemex and independent operators continue exploration and production across the Gulf of Mexico coastal zone, Tabasco, Veracruz, and Campeche. Pipeline route surveys, facility layout, and subsidence monitoring in the producing regions require RTK equipment rated for tropical humidity and heat.

Cadastral and urban mapping: Mexico's RAN (Registro Agrario Nacional) and municipal cadastral systems are undergoing large-scale modernisation. Ejido boundary surveys, urban parcel demarcation, and titling programmes across rural Mexico generate consistent demand for RTK cadastral survey, particularly in states with active land regularisation programmes such as Oaxaca, Chiapas, and Veracruz.

Mexico uses ITRF2008 (International Terrestrial Reference Frame 2008) as its official geodetic datum, adopted by INEGI as the reference frame for the national geodetic network. ITRF2008 is a global reference frame aligned to the IERS (International Earth Rotation and Reference Systems Service) standards.

Key parameters:

• Ellipsoid: GRS80
• Reference frame: ITRF2008, epoch 2010.0
• Relationship to WGS84: ITRF2008 and WGS84 differ by less than 1 metre at the global scale — for practical survey purposes at centimetre accuracy, WGS84 coordinates can be used as an ITRF2008 approximation in most engineering applications. For legal cadastral submissions to RAN or municipal registries, always select ITRF2008 explicitly.
• Previous datum: NAD27 (North American Datum 1927) and its successor NAD83 were previously used in Mexico. Many legacy cadastral maps and older engineering drawings still reference these datums. The shift between NAD27 and ITRF2008 can exceed 100 metres in some areas — confirm the datum on all project drawings before starting survey work.

In ApekSurv: Select ITRF2008 in Project → Coordinate System. The datum is pre-loaded in the APEKS coordinate library. For projects referencing legacy NAD27 or NAD83 data, apply the appropriate transformation in ApekSurv → Datum Transformation before integrating old and new survey data.

Mexico spans three UTM zones. Selecting the correct zone for your project location is essential — a zone mismatch produces coordinate errors of hundreds of kilometres.

• UTM Zone 13N: Northwestern Mexico — Sonora, Chihuahua (west), Sinaloa, Nayarit, Durango (west). Projects in Hermosillo, Culiacán, and the Sonora-Arizona border region use Zone 13N.
• UTM Zone 14N: Central Mexico — the majority of the country including Mexico City, Monterrey, Guadalajara, Puebla, Veracruz, Oaxaca, and most of the Gulf Coast. This is the most commonly used zone for Mexican infrastructure and industrial projects.
• UTM Zone 15N: Eastern Mexico and the Yucatán Peninsula — Quintana Roo, Yucatán, Campeche, Tabasco, Chiapas, and the southern Gulf of Mexico. Projects in Cancún, Mérida, and the Tren Maya corridor use Zone 15N.

For large linear infrastructure projects (highways, pipelines, rail) that cross a zone boundary, confirm the master project zone with the project engineer. All three UTM zones referenced to ITRF2008 are pre-loaded in ApekSurv — select the correct zone before recording any data.

RGNA (Red Geodésica Nacional Activa) is Mexico's national CORS network, operated by INEGI. It provides continuous RTK correction data across Mexico via NTRIP.

Network coverage: RGNA has reasonable coverage across Mexico's main urban and industrial corridors — Mexico City metropolitan area, Monterrey, Guadalajara, Puebla, and the Gulf Coast. Coverage is sparser in remote southern states (Chiapas highlands, Oaxaca Sierra), the Baja California peninsula, and the more isolated Gulf of Mexico production areas. Check INEGI's station map at inegi.org.mx before mobilising to remote project sites.

Registration: RGNA access requires registration with INEGI. Registration is available online at inegi.org.mx. Processing time is typically 3–7 working days. The service is free for registered users — a significant advantage over paid CORS networks in other Latin American countries.

NTRIP server details:

• Server address: ntrip.inegi.org.mx
• Port: 2101
• Format: RTCM 3.x (multi-constellation)
• Mountpoints: named by station location across Mexican states

Baseline recommendation: For reliable Fixed solution, stay within 50 km of the nearest RGNA reference station. In areas where RGNA coverage is sparse — southern Chiapas, remote Oaxaca, offshore Gulf areas — deploy an APEKS local base station on a known ITRF2008 control point rather than relying on a distant CORS mountpoint.

Private CORS networks: Several private commercial CORS networks operate in Mexico's major industrial corridors (Bajío, Monterrey region, Mexico City). These typically provide denser station coverage in their service areas at a subscription fee. For high-volume nearshoring construction projects in these corridors, commercial CORS networks may offer better baseline distances than RGNA.

Mexico uses GGM10 (Modelo Geoidal Mexicano 2010), published by INEGI, for converting GNSS ellipsoidal heights to orthometric heights referenced to the Mexican national vertical datum.

Why the geoid model matters: GNSS receivers output ellipsoidal height above the GRS80 ellipsoid. In Mexico, the geoid separation (N value) varies from approximately +5 metres to +40 metres depending on region — larger in the mountainous interior (Sierra Madre Occidental, Eje Volcánico Transversal) and smaller along the Gulf and Pacific coasts. Using ellipsoidal heights directly in drainage, road profile, or structural design introduces systematic elevation errors of this magnitude.

In ApekSurv: Apply GGM10 in Project → Coordinate System → Geoid Model. APEKS receivers include GGM10 in the pre-loaded geoid library. Select it explicitly — do not substitute EGM2008 for legal or engineering elevation work in Mexico, as the difference between GGM10 and EGM2008 can exceed 0.5 metres locally in mountainous terrain.

Verification: At the start of every session, check RTK elevation against a known levelled benchmark (BM from the Mexican national levelling network). The difference should be within ±25 mm. If it exceeds 50 mm, recheck the GGM10 geoid model selection and the base station coordinates.

1. Nearshoring industrial construction: The Bajío region (Guanajuato, Querétaro, Aguascalientes) and Nuevo León are experiencing intense industrial park construction driven by nearshoring investment from Asia and North America. RTK is the primary method for site layout, earthworks setting-out, and utility infrastructure alignment. The APEKS AP40 Laser+ with 120° IMU handles slope stake setting on cut-and-fill embankments efficiently across large industrial sites.

2. Tren Maya and southeast infrastructure: The Tren Maya rail corridor spanning Tabasco, Chiapas, Campeche, Yucatán, and Quintana Roo requires continuous RTK survey for alignment, earthworks, station layout, and as-built documentation across a 1,500 km route. UTM Zone 15N applies across most of this corridor. Cellular coverage is inconsistent in remote jungle sections — local base station deployment with APEKS MAX5 is the reliable solution for these segments.

3. Oil and gas — Gulf Coast: Pemex and independent operators survey pipeline routes, facility layout, and subsidence monitoring across Tabasco, Veracruz, and offshore platforms. IP67/IK08-rated receivers handle the humidity and heat of the Gulf Coast environment. APEKS AP40 Laser+ is used for pipeline route surveys where laser offset measurement reaches into vegetation without requiring the operator to enter the measurement corridor.

4. Cadastral and ejido boundary survey: RAN's ejido regularisation programmes across rural Mexico require RTK for parcel boundary demarcation and titling. ITRF2008 datum and correct UTM zone are mandatory for legal submissions. The APS1 handheld RTK is used for GIS data collection in support of cadastral programmes where full rover setup is impractical.

5. Urban development and municipal cadastre: Major urban expansion in Mexico City, Monterrey, Guadalajara, and secondary cities drives demand for cadastral RTK survey. Dense urban environments require full-constellation 1408-channel receivers to maintain Fixed solution quality near tall buildings and infrastructure.