[{"data":1,"prerenderedAt":1219},["ShallowReactive",2],{"knowledge-page-en-\u002Fsetup\u002Ftrimble-ntrip":3},{"article":4,"posts":494,"relatedPosts":495},{"id":5,"title":6,"author":7,"body":8,"category":479,"cover":480,"description":481,"extension":482,"meta":483,"navigation":484,"path":485,"publishedAt":486,"relatedArticles":487,"seo":490,"stem":491,"updatedAt":492,"__hash__":493},"knowledge_en\u002Fen\u002Fsetup\u002Ftrimble-ntrip.md","How to set up Trimble with NTRIP corrections","Yuri",{"type":9,"value":10,"toc":465},"minimark",[11,16,47,56,60,99,103,140,144,197,201,264,275,279,282,285,292,296,418,423],[12,13,15],"h2",{"id":14},"before-you-start","Before you start",[17,18,20,27,32,37,42],"requirements",{"additionalstyles":19},"mt-[30px]",[21,22,23],"requirement-item",{},[24,25,26],"p",{},"Trimble controller (TSC3, TSC5, TCU5, TDC600 or similar) with Trimble Access installed",[21,28,29],{},[24,30,31],{},"Trimble GNSS receiver (R10, R12, R780, SPS986 or similar) connected via Bluetooth",[21,33,34],{},[24,35,36],{},"NTRIP credentials: host address, port, mountpoint, username and password",[21,38,39],{},[24,40,41],{},"Internet connection on the controller (SIM card, Wi-Fi or tethered phone)",[21,43,44],{},[24,45,46],{},"A job with the correct coordinate system already configured",[48,49,53],"card",{"additionalstyles":50,"color":51,"title":52},"mt-[60px]","primary","Trimble Access version",[24,54,55],{},"The menu paths in this guide apply to Trimble Access 2022 and later. Earlier versions use the same settings but may have slightly different navigation. If your menus look different, check the Trimble Access help documentation for your specific version.",[12,57,59],{"id":58},"step-1-create-or-edit-a-rover-survey-style","Step 1 — Create or edit a rover survey style",[61,62,63,80],"stepper",{"additionalstyles":50},[64,65,68],"stepper-item",{"marker":66,"title":67},"1","Open Survey Styles",[24,69,70,71,75,76,79],{},"From the main menu, go to ",[72,73,74],"strong",{},"Settings → Survey Styles",". Tap an existing rover style to edit it, or tap ",[72,77,78],{},"New"," to create one. Name it something descriptive like “NTRIP Rover”.",[64,81,84],{"marker":82,"title":83},"2","Set the survey type to RTK",[24,85,86,87,90,91,94,95,98],{},"In the survey style, set ",[72,88,89],{},"Survey type"," to ",[72,92,93],{},"RTK",". Under ",[72,96,97],{},"Rover options",", ensure your receiver model is selected correctly.",[12,100,102],{"id":101},"step-2-configure-the-internet-data-link","Step 2 — Configure the internet data link",[61,104,105],{"additionalstyles":50},[64,106,109,127],{"marker":107,"title":108},"3","Open Rover radio \u002F data link settings",[24,110,111,112,115,116,119,120,90,123,126],{},"Inside the survey style, tap ",[72,113,114],{},"Rover radio"," (or ",[72,117,118],{},"Data link"," depending on your version). Set the ",[72,121,122],{},"Type",[72,124,125],{},"Internet connection",".",[24,128,129,130,90,133,136,137,126],{},"Set ",[72,131,132],{},"Internet source",[72,134,135],{},"Controller internet"," — this uses the controller's own SIM or Wi-Fi connection. If the receiver has a built-in SIM, you can alternatively select ",[72,138,139],{},"Receiver internet",[12,141,143],{"id":142},"step-3-enter-ntrip-settings","Step 3 — Enter NTRIP settings",[61,145,146,173],{"additionalstyles":50},[64,147,150,161,166],{"marker":148,"title":149},"4","Enable NTRIP and enter server details",[24,151,152,153,156,157,160],{},"Set the ",[72,154,155],{},"Use NTRIP"," switch to ",[72,158,159],{},"Yes",". Fill in the connection details from your NTRIP service. For RTKsub:",[162,163],"terminal-box",{"additionalstyles":164,"items":165},"mt-[24px]","IP Address|ntrip.rtksub.com||IP Port|2101||NTRIP username|your username||NTRIP password|your password||Mountpoint|leave blank to choose on start or enter one directly",[24,167,168,169,172],{},"Leave ",[72,170,171],{},"Mountpoint name"," empty for now — Trimble Access will present a list of available mountpoints when you start the survey. You can also enter one directly here to skip selection on each job start.",[64,174,177,183,190],{"marker":175,"title":176},"5","Configure NTRIP version and GGA",[24,178,168,179,182],{},[72,180,181],{},"Use NTRIP v1.0"," unchecked. Trimble Access automatically negotiates NTRIP version 2.0 if the server supports it — which all modern services do. Only check this box if you encounter connection problems.",[24,184,185,186,189],{},"For VRS mountpoints, check ",[72,187,188],{},"Send user identity info"," (or ensure GGA transmission is enabled). This sends your rover's position to the server so it can generate a virtual reference station near you.",[24,191,192,193,196],{},"Tap ",[72,194,195],{},"Accept"," to save the survey style.",[12,198,200],{"id":199},"step-4-start-the-survey-and-select-mountpoint","Step 4 — Start the survey and select mountpoint",[61,202,203,217,250],{"additionalstyles":50},[64,204,207,214],{"marker":205,"title":206},"6","Open a job and start survey",[24,208,209,210,213],{},"Open or create a job with the correct coordinate system. From the main menu tap ",[72,211,212],{},"Survey"," and select the NTRIP rover style you just created.",[24,215,216],{},"Trimble Access connects to the receiver via Bluetooth, then establishes an internet connection to the NTRIP server.",[64,218,221,235,245],{"marker":219,"title":220},"7","Select a mountpoint from the source table",[24,222,223,224,227,228,231,232,234],{},"A list of available mountpoints appears automatically. The list can be sorted by ",[72,225,226],{},"Distance",", ",[72,229,230],{},"Format"," or ",[72,233,171],{},". Tap a row to see more detail about that stream.",[24,236,237,238,241,242,126],{},"For Trimble receivers, select the MSM7 mountpoint — ",[72,239,240],{},"RTCM3_NL_MSM7"," — for maximum precision. For baselines over 30 km, choose the VRS mountpoint ",[72,243,244],{},"RTCM3_NL_VRS",[24,246,192,247,249],{},[72,248,195],{},". Corrections begin streaming immediately.",[64,251,254,261],{"marker":252,"title":253},"8","Verify RTK Fixed",[24,255,256,257,260],{},"Watch the position quality indicator in the status bar. It progresses from ",[72,258,259],{},"Autonomous → DGPS → Float → Fixed",". In good conditions with a nearby reference station, Fixed arrives within 10–60 seconds.",[24,262,263],{},"Once Fixed, your position is centimetre-accurate and you are ready to measure or stake out.",[48,265,268],{"additionalstyles":50,"color":266,"title":267},"green","RTK Fixed confirmed",[24,269,270,271,274],{},"Trimble Access shows “Fixed” in the position quality bar. The solution indicator turns green. You can verify correction flow in ",[72,272,273],{},"Instrument → Receiver Status → Data Link"," — the bytes received counter should be incrementing steadily.",[12,276,278],{"id":277},"using-vrs-with-trimble-access","Using VRS with Trimble Access",[24,280,281],{},"Trimble receivers work excellently with VRS (Virtual Reference Station) mountpoints. VRS eliminates baseline distance as a factor by generating a synthetic reference station close to your rover's position.",[24,283,284],{},"To use VRS in Trimble Access, the software must send your rover's NMEA GGA position to the NTRIP server. Trimble Access does this automatically when GGA transmission is enabled — which it is by default when NTRIP is active.",[48,286,289],{"additionalstyles":50,"color":287,"title":288},"orange","VRS and coordinate systems in Trimble Access",[24,290,291],{},"When you select a VRS mountpoint, Trimble Access may display a warning that the base data coordinate system differs from the job coordinate system. This is normal — the VRS stream is always in ETRS89\u002FWGS84. Your job coordinate system, for example RD New for the Netherlands, is applied separately through the calibration or datum transformation in the job settings. Dismiss the warning and continue — positions collected will be in your job's coordinate system.",[12,293,295],{"id":294},"troubleshooting","Troubleshooting",[297,298,299,315],"table",{},[300,301,302],"thead",{},[303,304,305,309,312],"tr",{},[306,307,308],"th",{},"Problem",[306,310,311],{},"Likely cause",[306,313,314],{},"Fix",[316,317,318,337,350,363,376,389,402],"tbody",{},[303,319,320,326,329],{},[321,322,323],"td",{},[72,324,325],{},"Cannot connect to NTRIP server",[321,327,328],{},"No internet, port 2101 blocked or wrong host",[321,330,331,332,336],{},"Test internet by opening a browser. Switch from Wi-Fi to mobile data. Check host address — no ",[333,334,335],"code",{},"http:\u002F\u002F"," prefix.",[303,338,339,344,347],{},[321,340,341],{},[72,342,343],{},"Sourcetable loads but no mountpoints match",[321,345,346],{},"Wrong credentials or server returns empty table",[321,348,349],{},"Verify username and password. Check subscription is active. Try logging in via a browser at the server address.",[303,351,352,357,360],{},[321,353,354],{},[72,355,356],{},"Stuck on Float — not reaching Fixed",[321,358,359],{},"Long baseline, obstructions, wrong mountpoint",[321,361,362],{},"Switch to VRS mountpoint. Check distance to nearest reference station. Move to open sky.",[303,364,365,370,373],{},[321,366,367],{},[72,368,369],{},"Warning: coordinate system mismatch",[321,371,372],{},"VRS stream in WGS84, job in local datum",[321,374,375],{},"This is normal. Dismiss the warning. Verify your job has the correct coordinate system and datum transformation configured.",[303,377,378,383,386],{},[321,379,380],{},[72,381,382],{},"Connection drops after a few minutes",[321,384,385],{},"Unstable mobile data in working area",[321,387,388],{},"Check signal strength. Use a dedicated mobile hotspot. Trimble Access automatically reconnects — wait for it to re-establish.",[303,390,391,396,399],{},[321,392,393],{},[72,394,395],{},"Fixed position has large offset from known points",[321,397,398],{},"Wrong coordinate system or datum transformation",[321,400,401],{},"Check job coordinate system. For Netherlands, verify RDNAPTRANS transformation is applied. For UK, verify OSTN15 is active.",[303,403,404,409,412],{},[321,405,406],{},[72,407,408],{},"Force NTRIP v1.0 message",[321,410,411],{},"Server or network does not support NTRIP v2",[321,413,414,415,417],{},"In the survey style data link settings, check ",[72,416,181],{},". This forces the older protocol compatible with all servers.",[419,420,422],"h3",{"id":421},"receiver-specific-notes","Receiver-specific notes",[424,425,428,447,453,459],"device-tabs",{"additionalstyles":426,"items":427},"mt-[40px]","R12 \u002F R12i|R10|SPS986|R780",[429,430,432,438,441],"device-tab",{"name":431},"R12 \u002F R12i",[24,433,434,437],{},[72,435,436],{},"Trimble R12 and R12i:"," The R12i has a built-in IMU for tilt compensation. When using NTRIP with the R12i, ensure the receiver has achieved a Fixed solution before activating tilt compensation — the IMU requires RTK Fix to calibrate correctly.",[24,439,440],{},"The R12 supports all RTCM3 MSM levels. Use MSM7 for best results. The R12i's RealFill technology may require a brief additional initialisation period at longer baselines — this is normal.",[24,442,443,446],{},[72,444,445],{},"Internet source:"," the R12 and R12i do not have a built-in SIM. Use Controller internet or tether the controller to a phone hotspot.",[429,448,450],{"name":449},"R10",[24,451,452],{},"Use the same NTRIP survey style. Confirm that the controller has a stable internet connection and select MSM7 for the highest available observation precision.",[429,454,456],{"name":455},"SPS986",[24,457,458],{},"Configure the receiver and controller with the same internet data-link settings. Select VRS for longer baselines and confirm the data-link byte counter is increasing.",[429,460,462],{"name":461},"R780",[24,463,464],{},"The R780 supports modern MSM mountpoints. Use MSM7 for survey work and VRS when your nearest physical reference station is more than 30 km away.",{"title":466,"searchDepth":467,"depth":467,"links":468},"",2,[469,470,471,472,473,474,475],{"id":14,"depth":467,"text":15},{"id":58,"depth":467,"text":59},{"id":101,"depth":467,"text":102},{"id":142,"depth":467,"text":143},{"id":199,"depth":467,"text":200},{"id":277,"depth":467,"text":278},{"id":294,"depth":467,"text":295,"children":476},[477],{"id":421,"depth":478,"text":422},3,"setup","Setup\u002FWebP\u002Fhow-to-set-up-trimble-with-ntrip_corrections.webp","Trimble Access has built-in NTRIP support. This guide walks you through creating a survey style with an internet data link, connecting to an NTRIP server and selecting the right mountpoint — for any Trimble controller and any NTRIP service.","md",{},true,"\u002Fen\u002Fsetup\u002Ftrimble-ntrip","2026-07-25",[488,489],"\u002Fen\u002Flearn\u002Fwhich-mountpoint","\u002Fen\u002Flearn\u002Fwhat-is-vrs",{"title":6,"description":481},"en\u002Fsetup\u002Ftrimble-ntrip",null,"nCnfUSd7pXNExzpt201yYS3GkfV2Z_xc24TZZOjTFlM",[],[496,817],{"id":497,"title":498,"author":7,"body":499,"category":808,"cover":809,"description":810,"extension":482,"meta":811,"navigation":484,"path":488,"publishedAt":486,"relatedArticles":812,"seo":814,"stem":815,"updatedAt":492,"__hash__":816},"knowledge_en\u002Fen\u002Flearn\u002Fwhich-mountpoint.md","Which NTRIP mountpoint should I choose?",{"type":9,"value":500,"toc":801},[501,505,508,528,532,535,553,557,659,667,671,674,753,761,765,775,786,795],[12,502,504],{"id":503},"quick-mountpoint-finder","Quick mountpoint finder",[24,506,507],{},"Choose by device first, then use VRS whenever the nearest reference station is more than 30 km away or Fix is unstable.",[509,510,511,516,520,524],"cards",{"additionalstyles":50},[512,513],"cards-item",{"text":514,"title":515},"Use MSM4 for Emlid Reach RS \u002F RX, u-blox ZED-F9P, SW Maps, FieldGenius and most generic NTRIP clients.","Most devices within 30 km → RTCM3_NL",[512,517],{"text":518,"title":519},"DJI requires MSM5 Doppler observations to initialise Fix. Do not use the MSM4 default mountpoint for DJI.","Any DJI RTK drone → RTCM3_NL_MSM5",[512,521],{"text":522,"title":523},"MSM7 supplies extended-precision observations that high-end survey receivers can use.","Trimble, Leica or high-end survey → RTCM3_NL_MSM7",[512,525],{"text":526,"title":527},"VRS shortens the effective baseline to 1–2 km. Enable GGA transmission before connecting.","Any device beyond 30 km → RTCM3_NL_VRS",[12,529,531],{"id":530},"all-mountpoints-explained","All mountpoints explained",[24,533,534],{},"RTKsub exposes four mountpoints. Each is optimised for a different combination of device type and working distance.",[509,536,537,541,545,549],{"additionalstyles":50},[512,538],{"text":539,"title":540},"The standard mountpoint. Delivers RTCM3 corrections in MSM4 format — compact, efficient and compatible with virtually every modern RTK receiver. Includes GPS, GLONASS, Galileo and BeiDou on all frequencies. Use it within 30 km when your device is not a DJI drone or a high-end survey receiver.","RTCM3_NL — MSM4",[512,542],{"text":543,"title":544},"MSM5 adds Doppler observations to the standard MSM4 data. DJI's RTK implementation specifically requires Doppler to initialise correctly. Outside DJI, MSM5 is rarely needed because standard devices perform identically on MSM4 and MSM5.","RTCM3_NL_MSM5 — MSM5",[512,546],{"text":547,"title":548},"MSM7 provides the same observations as MSM4 but at full extended precision. Trimble, Leica, Septentrio and NovAtel receivers can use this extra precision, particularly in challenging baselines and environments. It uses roughly twice the bandwidth of MSM4.","RTCM3_NL_MSM7 — MSM7",[512,550],{"text":551,"title":552},"VRS generates a virtual reference station 1–2 km from your rover using data from multiple surrounding physical stations. Fix initialisation is faster and Fix stability is higher. Send GGA to the caster or the stream returns zero bytes.","RTCM3_NL_VRS — VRS MSM4",[12,554,556],{"id":555},"side-by-side-comparison","Side-by-side comparison",[297,558,559,581],{},[300,560,561],{},[303,562,563,566,569,572,575,578],{},[306,564,565],{},"Mountpoint",[306,567,568],{},"MSM level",[306,570,571],{},"GGA required",[306,573,574],{},"DJI works",[306,576,577],{},"Trimble \u002F Leica best",[306,579,580],{},"Use when",[316,582,583,603,622,640],{},[303,584,585,590,593,596,598,600],{},[321,586,587],{},[333,588,589],{},"RTCM3_NL",[321,591,592],{},"MSM4",[321,594,595],{},"No",[321,597,595],{},[321,599,595],{},[321,601,602],{},"Default for most devices, baseline \u003C30 km",[303,604,605,610,613,615,617,619],{},[321,606,607],{},[333,608,609],{},"RTCM3_NL_MSM5",[321,611,612],{},"MSM5",[321,614,595],{},[321,616,159],{},[321,618,595],{},[321,620,621],{},"DJI drones only",[303,623,624,628,631,633,635,637],{},[321,625,626],{},[333,627,240],{},[321,629,630],{},"MSM7",[321,632,595],{},[321,634,595],{},[321,636,159],{},[321,638,639],{},"Trimble, Leica, high-end survey",[303,641,642,646,649,651,654,656],{},[321,643,644],{},[333,645,244],{},[321,647,648],{},"MSM4 + VRS",[321,650,159],{},[321,652,653],{},"Yes*",[321,655,159],{},[321,657,658],{},"Baseline >30 km or Fix instability",[24,660,661,662,664,665,126],{},"*DJI on VRS: use ",[333,663,244],{}," for long-baseline DJI work. For short baselines, use ",[333,666,609],{},[12,668,670],{"id":669},"what-happens-with-the-wrong-mountpoint","What happens with the wrong mountpoint",[24,672,673],{},"The consequences of the wrong mountpoint depend on which way you get it wrong. None of them produce an obvious error message — which is why choosing correctly matters.",[297,675,676,689],{},[300,677,678],{},[303,679,680,683,686],{},[306,681,682],{},"Situation",[306,684,685],{},"Symptom",[306,687,688],{},"What is actually happening",[316,690,691,705,716,729,742],{},[303,692,693,699,702],{},[321,694,695,696,698],{},"DJI drone on ",[333,697,589],{}," (MSM4)",[321,700,701],{},"Stuck on Float indefinitely",[321,703,704],{},"DJI needs Doppler data (MSM5 minimum). MSM4 corrections flow but Fix never initialises.",[303,706,707,710,713],{},[321,708,709],{},"Any device on VRS without GGA",[321,711,712],{},"Connected, 0 bytes\u002Fsec",[321,714,715],{},"Server cannot generate a virtual station. The connection appears active but the stream is empty.",[303,717,718,723,726],{},[321,719,720,721],{},"Emlid on ",[333,722,240],{},[321,724,725],{},"Works fine — no problem",[321,727,728],{},"Emlid ignores the extra precision in MSM7. Slightly higher bandwidth, otherwise identical result.",[303,730,731,736,739],{},[321,732,733,734,698],{},"Trimble on ",[333,735,589],{},[321,737,738],{},"Fix achieved, slightly lower accuracy",[321,740,741],{},"Works correctly. Missing the extended precision that MSM7 provides — a marginal difference in most conditions.",[303,743,744,747,750],{},[321,745,746],{},"Any device, wrong region mountpoint",[321,748,749],{},"No corrections or very poor Fix",[321,751,752],{},"Corrections come from distant stations, so the baseline is huge.",[48,754,756],{"additionalstyles":50,"color":287,"title":755},"The DJI mistake is the most common",[24,757,758,759,126],{},"The most frequent support question about mountpoints is: “My DJI drone connects fine but never reaches Fix.” The answer is almost always MSM4 instead of MSM5. If you fly DJI, always use ",[333,760,609],{},[12,762,764],{"id":763},"finding-mountpoints-in-the-sourcetable","Finding mountpoints in the sourcetable",[24,766,767,768,231,771,774],{},"Every NTRIP server publishes a sourcetable — a list of all available correction streams with metadata. Your NTRIP client usually has a ",[72,769,770],{},"Get Mountpoints",[72,772,773],{},"Download Source Table"," button that fetches and displays this list.",[24,776,777,778,781,782,785],{},"If you need to read the raw sourcetable, you can request it from any NTRIP server by connecting to the host address in a browser or with a tool like ",[333,779,780],{},"curl",". Each line starting with ",[333,783,784],{},"STR;"," is a mountpoint. The fields are semicolon-separated and include the mountpoint name, format, message types and coordinates of the reference station.",[48,787,789],{"additionalstyles":50,"color":51,"title":788},"Sort by distance in Trimble Access",[24,790,791,792,794],{},"When the sourcetable loads in Trimble Access, tap the sort button and choose ",[72,793,226],{},". The nearest physical station appears at the top. If the nearest station is more than 30 km away, switch to the VRS mountpoint rather than the top result.",[48,796,798],{"additionalstyles":19,"color":266,"title":797},"Still unsure? Ask the AI.",[24,799,800],{},"If you have an unusual device or a situation not covered here, describe your device model, NTRIP client and intended work. You can then get a specific recommendation.",{"title":466,"searchDepth":467,"depth":467,"links":802},[803,804,805,806,807],{"id":503,"depth":467,"text":504},{"id":530,"depth":467,"text":531},{"id":555,"depth":467,"text":556},{"id":669,"depth":467,"text":670},{"id":763,"depth":467,"text":764},"learn","learn\u002Fwhich-ntrip-mountpoint-should-i-choose.webp","The right mountpoint depends on two things your device and your baseline. Choose the wrong one and you may get Float instead of Fix, or Fix without the accuracy your receiver is capable of.",{},[813,489],"\u002Fen\u002Flearn\u002Fwhat-is-rtcm",{"title":498,"description":810},"en\u002Flearn\u002Fwhich-mountpoint","2oy9yd-U6YpNzoth9z555eT4WEjXlUdxBk5m0gbX-Kc",{"id":818,"title":819,"author":7,"body":820,"category":808,"cover":1210,"description":1211,"extension":482,"meta":1212,"navigation":484,"path":489,"publishedAt":486,"relatedArticles":1213,"seo":1216,"stem":1217,"updatedAt":492,"__hash__":1218},"knowledge_en\u002Fen\u002Flearn\u002Fwhat-is-vrs.md","What is VRS and when do you need it?",{"type":9,"value":821,"toc":1201},[822,826,833,836,839,859,863,866,898,904,908,911,986,990,1016,1020,1027,1030,1036,1042,1046,1049,1119,1123,1126,1195],[12,823,825],{"id":824},"what-vrs-is-and-why-it-exists","What VRS is and why it exists",[24,827,828,829,832],{},"VRS stands for ",[72,830,831],{},"Virtual Reference Station",". It is a network RTK technology that makes your receiver work as if a physical base station were located just beside you, wherever you are within the correction network's coverage area.",[24,834,835],{},"With a normal single-station NTRIP mountpoint, your rover receives corrections from one physical reference station. That station can be 20, 40 or even 60 kilometres away. As the baseline gets longer, the atmospheric conditions at your rover become less like those at the station. Ionospheric and tropospheric errors then make RTK initialisation slower and a Fixed solution less stable.",[24,837,838],{},"VRS solves that problem on the server. It combines observations from several surrounding reference stations, models the conditions at your location and sends a synthetic RTCM correction stream. To your receiver, it looks exactly like corrections from a nearby base station.",[840,841,842,847,851,855],"text-grid",{"additionalstyles":50},[843,844],"text-grid-item",{"text":845,"title":846},"Typical effective VRS baseline","1–2 km",[843,848],{"text":849,"title":850},"Reference stations used around you","3+",[843,852],{"text":853,"title":854},"Position message required by VRS","GGA",[843,856],{"text":857,"title":858},"Correction format your rover receives","RTCM3",[12,860,862],{"id":861},"how-vrs-works","How VRS works",[24,864,865],{},"VRS is a server-side calculation that runs invisibly behind your NTRIP connection. The sequence is straightforward:",[61,867,868,874,880,886,892],{"additionalstyles":50},[64,869,871],{"title":870},"Connect to a VRS mountpoint",[24,872,873],{},"Your NTRIP client connects to the correction service and sends an NMEA GGA sentence with its approximate position. This two-way communication is what makes VRS different from a normal single-station stream.",[64,875,877],{"title":876},"The server places you in the network",[24,878,879],{},"The VRS server uses your GGA position to identify the physical reference stations around you. It typically selects three or more nearby stations to build the correction model.",[64,881,883],{"title":882},"Atmospheric conditions are modelled",[24,884,885],{},"The server interpolates the ionospheric and tropospheric differences observed across those stations. It estimates the errors that apply at your exact working location.",[64,887,889],{"title":888},"A virtual station is created",[24,890,891],{},"The server synthesises an RTCM3 stream as if a base station existed only a kilometre or two from your rover. No physical hardware is installed at that virtual location.",[64,893,895],{"title":894},"Your receiver computes RTK normally",[24,896,897],{},"Your receiver processes the VRS corrections like any other RTCM3 stream. It does not need to know whether the corrections came from a real or virtual station; it simply benefits from the short effective baseline.",[48,899,901],{"additionalstyles":50,"color":51,"title":900},"VRS changes the effective baseline, not your equipment",[24,902,903],{},"You still use the same rover, field software and NTRIP credentials. Select a VRS mountpoint and transmit GGA; the network does the additional calculation for you.",[12,905,907],{"id":906},"standard-mountpoint-vs-vrs","Standard mountpoint vs VRS",[24,909,910],{},"Both options use the same correction network. The important difference is how the correction stream is made.",[912,913,917,933,947,960,973],"compare-table",{"additionalstyles":50,"items":914,"label":915,"winner":916},"Standard mountpoint|VRS mountpoint","Standard NTRIP and VRS comparison","VRS mountpoint",[918,919,921,928],"compare-row",{"title":920},"Correction source",[922,923,925],"compare-cell",{"status":924},"positive",[24,926,927],{},"One physical reference station.",[922,929,930],{"status":924},[24,931,932],{},"A virtual station calculated from multiple physical stations.",[918,934,936,942],{"title":935},"Effective baseline",[922,937,939],{"status":938},"negative",[24,940,941],{},"The actual distance to the selected station. It may be tens of kilometres.",[922,943,944],{"status":924},[24,945,946],{},"Usually around 1–2 km, even when physical stations are far away.",[918,948,950,955],{"title":949},"GGA transmission",[922,951,952],{"status":924},[24,953,954],{},"Usually not required.",[922,956,957],{"status":938},[24,958,959],{},"Required so the server can generate corrections for your location.",[918,961,963,968],{"title":962},"Working over a large area",[922,964,965],{"status":938},[24,966,967],{},"You may need to change mountpoints as the nearest station changes.",[922,969,970],{"status":924},[24,971,972],{},"The network adapts to your position automatically.",[918,974,976,981],{"title":975},"Fix reliability at long distances",[922,977,978],{"status":938},[24,979,980],{},"Can degrade as atmospheric differences increase.",[922,982,983],{"status":924},[24,984,985],{},"Typically faster to initialise and more stable across the network.",[12,987,989],{"id":988},"when-to-use-vrs-and-when-not-to","When to use VRS — and when not to",[509,991,992,996,1000,1004,1008,1012],{"additionalstyles":50},[512,993],{"text":994,"title":995},"Once the nearest physical station is more than roughly 20–30 km away, a VRS stream reduces the baseline-related errors that can keep a receiver in Float or make Fix drop.","Use VRS beyond 20–30 km",[512,997],{"text":998,"title":999},"For work that covers a large area in one day, VRS follows your approximate location. You do not need to keep choosing a different physical station as you travel.","Use VRS when moving across a region",[512,1001],{"text":1002,"title":1003},"If your sky view and connection are good but Fix repeatedly drops on a standard mountpoint, switching to VRS removes baseline length as a likely cause.","Use VRS for unstable Fix",[512,1005],{"text":1006,"title":1007},"High solar activity and geomagnetic disturbances increase ionospheric errors. The network model in a VRS service can compensate for spatial differences much better than a distant single station.","Use VRS during disturbed conditions",[512,1009],{"text":1010,"title":1011},"Within about 15 km of a physical reference station, the atmospheric difference is usually small. A standard mountpoint can work just as well and does not depend on GGA.","A nearby station may be enough",[512,1013],{"text":1014,"title":1015},"The server must receive your GGA position. Without mobile data at the rover, use a local base and radio link or another correction method that works offline.","VRS needs an internet connection",[12,1017,1019],{"id":1018},"the-gga-requirement-explained","The GGA requirement explained",[24,1021,1022,1023,1026],{},"VRS has one requirement that a standard NTRIP connection normally does not: your client must send an ",[72,1024,1025],{},"NMEA GGA sentence"," to the caster. GGA includes latitude, longitude, altitude and fix quality. The server uses it to decide which part of its atmospheric model applies to you and where to place the virtual reference station.",[24,1028,1029],{},"The position does not need to be centimetre accurate. A Single or Float position is enough to locate you in the correct network area. However, the GGA must contain a valid position before you connect.",[48,1031,1033],{"additionalstyles":50,"color":287,"title":1032},"Connected, but receiving 0 bytes per second? Check GGA first.",[24,1034,1035],{},"When GGA is disabled, a connection to a VRS mountpoint can look successful but the caster may send no correction data. Your receiver stays on Single and there may be no obvious error message. Enable GGA transmission, then reconnect.",[48,1037,1039],{"additionalstyles":19,"color":51,"title":1038},"Wait for a valid initial position",[24,1040,1041],{},"Before connecting, give the receiver 30–60 seconds outdoors to obtain satellite lock. A GGA sentence with zero coordinates can be rejected by the server or place the virtual station in the wrong area.",[12,1043,1045],{"id":1044},"how-to-enable-vrs-on-your-device","How to enable VRS on your device",[24,1047,1048],{},"Select the VRS mountpoint supplied by your correction provider, then make sure GGA transmission is enabled. The wording differs slightly by application.",[424,1050,1052,1066,1076,1089,1099,1109],{"additionalstyles":50,"items":1051},"Emlid Flow|Trimble Access|SW Maps|FieldGenius|DJI Pilot|Lefebure NTRIP",[429,1053,1055],{"name":1054},"Emlid Flow",[24,1056,1057,1058,1061,1062,1065],{},"Go to ",[72,1059,1060],{},"Correction input → NTRIP",". Select your provider's VRS mountpoint, enable ",[72,1063,1064],{},"Send GGA to caster",", then connect after the receiver has a Single solution.",[429,1067,1069],{"name":1068},"Trimble Access",[24,1070,1071,1072,1075],{},"Open ",[72,1073,1074],{},"Survey Style → Rover radio",", then enter the VRS mountpoint in the NTRIP settings. Trimble Access normally sends GGA automatically while NTRIP is active.",[429,1077,1079],{"name":1078},"SW Maps",[24,1080,1057,1081,1084,1085,1088],{},[72,1082,1083],{},"Settings → NTRIP Client",", choose the VRS mountpoint from the sourcetable and enable ",[72,1086,1087],{},"Transmit GGA"," before tapping Connect.",[429,1090,1092],{"name":1091},"FieldGenius",[24,1093,1094,1095,1098],{},"Choose ",[72,1096,1097],{},"Set Up Corrections → RTK via Internet",", add a source with the VRS mountpoint and enable GGA transmission in the data-link settings. Confirm the antenna height, then connect.",[429,1100,1102],{"name":1101},"DJI Pilot",[24,1103,1104,1105,1108],{},"In ",[72,1106,1107],{},"RTK Settings → Custom Network RTK",", enter the VRS mountpoint provided by your service. DJI sends GGA automatically after it has GPS lock, so configure it outdoors.",[429,1110,1112],{"name":1111},"Lefebure NTRIP",[24,1113,1114,1115,1118],{},"Enter the caster host, port and VRS mountpoint. Enable ",[72,1116,1117],{},"Send GGA"," in the app settings and select your receiver or the phone's internal GPS as the GGA source.",[12,1120,1122],{"id":1121},"vrs-by-another-name","VRS by another name",[24,1124,1125],{},"VRS is the most common name for network RTK, but it is not the only approach. A sourcetable may also contain these alternatives:",[297,1127,1128,1141],{},[300,1129,1130],{},[303,1131,1132,1135,1138],{},[306,1133,1134],{},"Name",[306,1136,1137],{},"What it does",[306,1139,1140],{},"What you need to know",[316,1142,1143,1156,1169,1182],{},[303,1144,1145,1150,1153],{},[321,1146,1147],{},[72,1148,1149],{},"MAC",[321,1151,1152],{},"The caster sends observations from a master station and auxiliary stations; the receiver performs the network calculation.",[321,1154,1155],{},"Common with Leica systems. GGA is not always required.",[303,1157,1158,1163,1166],{},[321,1159,1160],{},[72,1161,1162],{},"FKP",[321,1164,1165],{},"The caster sends area-correction parameters that the receiver applies to a single-station stream.",[321,1167,1168],{},"An older network format that is less common today.",[303,1170,1171,1176,1179],{},[321,1172,1173],{},[72,1174,1175],{},"iMAX",[321,1177,1178],{},"A personalised version of the Master-Auxiliary approach.",[321,1180,1181],{},"Functionally similar to VRS for most users.",[303,1183,1184,1189,1192],{},[321,1185,1186],{},[72,1187,1188],{},"SSR \u002F SSRZ",[321,1190,1191],{},"Separately models satellite orbits, clocks and atmospheric effects.",[321,1193,1194],{},"A newer approach that is becoming more common in modern networks.",[48,1196,1198],{"additionalstyles":50,"color":266,"title":1197},"For most users, choose the VRS mountpoint",[24,1199,1200],{},"Unless your receiver or correction provider specifically asks for MAC, FKP or another format, VRS is the practical default. It works with modern RTK receivers and gives you near-local network corrections throughout the covered area.",{"title":466,"searchDepth":467,"depth":467,"links":1202},[1203,1204,1205,1206,1207,1208,1209],{"id":824,"depth":467,"text":825},{"id":861,"depth":467,"text":862},{"id":906,"depth":467,"text":907},{"id":988,"depth":467,"text":989},{"id":1018,"depth":467,"text":1019},{"id":1044,"depth":467,"text":1045},{"id":1121,"depth":467,"text":1122},"learn\u002Fwhat-is-vrs.webp","VRS (Virtual Reference Station) makes a correction network behave as though a base station is right beside your rover. It eliminates long-baseline errors, improves Fix reliability across a network and is simple to use once GGA transmission is enabled.",{},[1214,1215],"\u002Fen\u002Flearn\u002Fwhat-is-ntrip","\u002Fen\u002Flearn\u002Ffloat-vs-fix",{"title":819,"description":1211},"en\u002Flearn\u002Fwhat-is-vrs","Q_R7dGN8SakA5nbtnxs_dK8uAMrv0Wf41kDVzWa369Y",1787304715295]