DATA CHECKED OCT 2026
Regional networks / REIL-Net RTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.More Network

REIL-Net RTK Network

Free  Karaco (dealer)

Plans & pricing

Free
PlanPriceTerm
ReIL-NET MAX RTK access$200 (store listing)
Single-baselineFree for single base (per Seiler table)
Constellations
GPSThe US satellite navigation system. People often use "GPS" to mean all satellite positioning.More (incl. L5), GLONASS, Galileo on MSM5 mounts
Correction formats
RTCMThe common format RTK corrections are written in, so different brands can understand each other.More.1 MSM5, RTCM3 (network MAX/NEAREST, VRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.More)
Stations
55+ Base stationA GNSS receiver sitting still on a known spot. It figures out how wrong the satellite signals are right now and shares that as corrections.More across Chicagoland and Central Illinois

NTRIP caster

hostrtk.karaco.com (per Seiler table)
PortA number that tells your device which "door" on the caster server to use. For NTRIP it's often 2101.More12050 network; 12051 single base; 12054 ISTHA; 12055 DuPage County
mountsNEAREST-RTCM3, VRS-RTCM3-MSM5, station mounts e.g. NAPERVILLE-RTCM3.1-MSM5
Free single-base streams (port 12055). Network solution (port 12050) is paid. CasterThe internet server that hands out correction streams. Your rover logs in to it, like tuning into a radio station.More rtk.karaco.com. Source: Seiler's network list. We did not read Karaco's page.
Checked 2026-10-16 Sources: [1] [2] · Blank fields mean the operator doesn't publish it · Report a change

Reliability reports

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