YDQA: Ep 145- "How Do You Connect Your Drone to an RTK Network? NTRIP & Mount Points Explained"
How do you actually connect your drone to an RTK network, and what do all those settings mean?RTK (real-time kinematic) takes your drone from GPS that's only good to within a few feet down to centimeter-level accuracy, by streaming corrections from a base station on a known spot. To get those corrections you need an account on a correction network (many states run one for free), an internet connection on your controller, and a handful of settings: the NTRIP address, port, mount point, message type, and your username and password.In this episode of Your Drone Questions. Answered (YDQA), David Young explains how RTK corrections work, where they come from (CORS stations, free and paid state networks, private networks like Trimble's, or your own base station), and why your baseline should stay within about 10-20 km. Then he walks through a real job: connecting a DJI Matrice 4E to Alabama's free ALDOT network, from signing up and finding the station list to filling in the Custom Network RTK screen in DJI Pilot 2, picking a port and mount point (RTCM3 vs MSM4), and what FLOAT vs FIX means.Questions we cover:- What is RTK, and why does your drone need GPS corrections?- What throws off satellite signals?- How do CORS reference stations work?- How far can you be from the base station (your baseline)?- Are RTK networks free in your state?- Should you use your own base station or NTRIP?- Why do drones need centimeter-level accuracy?- What do the NTRIP address, port and mount point mean?- RTCM3 or MSM4: which message type should you pick?- What's the difference between RTK FLOAT and FIX?- RTK vs PPK: what's the difference?Chapters:0:00 How to connect your drone to an RTK network0:44 What is RTK? (real-time kinematic)1:11 Why your drone needs GPS corrections1:53 What throws off satellite signals2:26 The RTK module and reference stations2:54 CORS stations and how corrections work3:45 Baseline: how far from the base station?4:36 How the corrections reach your controller4:54 Free vs paid state RTK networks5:28 Your own base station vs NTRIP6:53 Why drones need centimeter-level accuracy8:14 Worked example: Alabama's free ALDOT network9:40 Station list, IP address and port10:16 DJI Pilot 2: Custom Network RTK setup11:28 Finding your nearest station11:52 Mount points and message types (RTCM3 vs MSM4)13:29 RTK FLOAT vs FIX13:59 RTK vs PPK14:42 Recap: the settings you needStates with free real-time RTK networks (as of November 2026):Alabama, Alaska, Arkansas, Connecticut, Florida, Indiana, Iowa, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, New York and Oregon. Mesa County, Colorado also runs a free county network. Kentucky, Maine, Ohio, Vermont and West Virginia list no fee but don't say "free" outright. Sign-up rules change, so confirm with your state before a job.The settings David used in Alabama:NTRIP address: 205.172.52.26Port: 10099 (one specific station) or 10011 (nearest / auto)Mount point: AL10_MSM4 (Guntersville station, RTCM 3 MSM4)Username and password: your own ALDOT accountLinks from the episode:ALDOT CORS sign-up: https://aldotcors.dot.state.al.us/SBC/Account/RegisterNOAA NGS CORS Network: https://geodesy.noaa.gov/CORS/NGS guidelines for single-base RTK (20 km baseline): https://geodesy.noaa.gov/library/pdfs/NOAA_Manual_NOS_NGS_0009.pdfWashington State Reference Network FAQ (10 km): http://www.wsrn.org/WSRN_FAQ.pdfDJI Matrice 4 Series user manual (Custom Network RTK): https://dl.djicdn.com/downloads/DJI_Matrice_4_Series/DJI_Matrice_4_Series_User_Manual_en.pdfHave a drone question you want answered on the show? Email [email protected]#RTK #NTRIP #DroneMapping #DJI #GNSS #Matrice4E #DronePilot #Surveying #YDQA