NTRIP & GGA essentials

NTRIP & GGA essentials - the path to RTK: FIX

Most NTRIP workflows require your rover’s approximate position (NMEA GGA) to choose the nearest reference or create a virtual reference (VRS). If GGA is not sent shortly after you connect, many casters won’t stream corrections.

Checklist that applies to every app

• • Use the regional hostname (preferred). If your device only accepts numbers or DNS is blocked, use the numeric IP fallback. Port = 2101.

• Enter credentials exactly as provided in your RTKdata.com account

• Mountpoint: AUTO (recommended) or AUTO_WGS84 / AUTO_ITRF2020 / AUTO_ITRF2014 (ALL CAPS)

• Send receiver position (NMEA GGA): ON

• Go outdoors with open sky and wait for RTK: FIX

Where to enable GGA (common apps)

• Emlid Flow: Correction input → NTRIP → Send receiver position (NMEA) = ON

• u‑center (u‑blox): Receiver → NTRIP Client… (client logic uses your current position; ensure the receiver is outputting a valid solution)

• Septentrio RxTools: RxControl → Output Settings → NMEA → GGA @ 1 s (USB/COM); DataLink will forward it

• SW Maps: NTRIP settings → Send NMEA GGA to caster = ON

• EOS Tools Pro: NTRIP/Differential → Send NMEA GGA to caster = ON

Vertical reference (heights)

RTKdata.com streams positions in the selected geodetic frame; heights are ellipsoidal. For orthometric (mean sea level) elevations, apply a geoid in your GIS/photogrammetry workflow (or on the rover if supported).