[{"data":1,"prerenderedAt":926},["ShallowReactive",2],{"knowledge-page-en-\u002Flearn\u002Fbase-station-vs-ntrip":3},{"article":4,"posts":291,"relatedPosts":292},{"id":5,"title":6,"author":7,"body":8,"category":276,"cover":277,"description":278,"extension":279,"meta":280,"navigation":281,"path":282,"publishedAt":283,"relatedArticles":284,"seo":287,"stem":288,"updatedAt":289,"__hash__":290},"knowledge_en\u002Fen\u002Flearn\u002Fbase-station-vs-ntrip.md","Own base station vs NTRIP network — which is better?","Yuri",{"type":9,"value":10,"toc":263},"minimark",[11,16,21,25,28,32,35,38,42,183,187,190,197,204,212,216,252,256],[12,13,15],"h2",{"id":14},"how-each-approach-works","How each approach works",[17,18,20],"h3",{"id":19},"own-base-station","Own base station",[22,23,24],"p",{},"You set up a second GNSS receiver at a known or averaged position on site. This receiver stays stationary and transmits corrections to your rover via radio (UHF) or internet (using a caster like Emlid Caster). You control everything — the hardware, the data and the baseline distance.",[22,26,27],{},"The base-rover approach has been the standard in professional surveying for decades. It works anywhere, even without mobile data or internet. The corrections are always fresh and always local because the base is physically close to your work area.",[17,29,31],{"id":30},"ntrip-correction-service","NTRIP correction service",[22,33,34],{},"You connect your rover to an NTRIP server over the internet. The server streams corrections from a network of permanently installed reference stations. You need only one receiver in the field — no base station to set up, survey or monitor.",[22,36,37],{},"Modern NTRIP networks such as GEODNET cover entire countries and continents. VRS technology eliminates the baseline distance problem by generating a virtual reference station next to your rover. The accuracy is comparable to a local base station for most professional applications.",[12,39,41],{"id":40},"head-to-head-comparison","Head-to-head comparison",[43,44,49,66,79,92,105,118,131,144,157,170],"compare-table",{"additionalstyles":45,"items":46,"label":47,"winner":48},"mt-[60px]","Own base station|NTRIP network","Base station and NTRIP comparison","NTRIP network",[50,51,53,60],"compare-row",{"title":52},"Setup time",[54,55,57],"compare-cell",{"status":56},"negative",[22,58,59],{},"15–45 min per job. Set up tripod, level, survey or average base position, configure radio link.",[54,61,63],{"status":62},"positive",[22,64,65],{},"Under 2 minutes. Enter credentials once, connect on every job.",[50,67,69,74],{"title":68},"Hardware cost",[54,70,71],{"status":56},[22,72,73],{},"€800–€5,000+ for a second receiver, tripod, radio and accessories.",[54,75,76],{"status":62},[22,77,78],{},"No additional hardware. One rover is enough.",[50,80,82,87],{"title":81},"Ongoing cost",[54,83,84],{"status":62},[22,85,86],{},"Maintenance only. No monthly fees once hardware is paid for.",[54,88,89],{"status":56},[22,90,91],{},"Monthly or annual subscription. Typically €14–€100\u002Fmonth depending on service and plan.",[50,93,95,100],{"title":94},"Accuracy",[54,96,97],{"status":62},[22,98,99],{},"Best at short baselines (\u003C10 km). Highest absolute accuracy when base is on a known point.",[54,101,102],{"status":62},[22,103,104],{},"Comparable accuracy with VRS. 1–3 cm horizontal in most conditions.",[50,106,108,113],{"title":107},"Works without internet",[54,109,110],{"status":62},[22,111,112],{},"Yes — radio link works anywhere.",[54,114,115],{"status":56},[22,116,117],{},"No — requires mobile data at the rover.",[50,119,121,126],{"title":120},"Coverage area per day",[54,122,123],{"status":56},[22,124,125],{},"Limited to ~10–30 km radius from base. Reposition base for large projects.",[54,127,128],{"status":62},[22,129,130],{},"Unlimited within network coverage. Drive anywhere and corrections follow.",[50,132,134,139],{"title":133},"Works in remote areas",[54,135,136],{"status":62},[22,137,138],{},"Yes — no infrastructure needed.",[54,140,141],{"status":56},[22,142,143],{},"Only where mobile data is available.",[50,145,147,152],{"title":146},"Number of rovers",[54,148,149],{"status":62},[22,150,151],{},"One base can serve multiple rovers simultaneously at no extra cost.",[54,153,154],{"status":56},[22,155,156],{},"Each rover typically needs its own subscription or concurrent connection slot.",[50,158,160,165],{"title":159},"Coordinate traceability",[54,161,162],{"status":62},[22,163,164],{},"Full control — base on known national coordinate point gives legally traceable positions.",[54,166,167],{"status":62},[22,168,169],{},"ETRS89\u002FWGS84 — nationally traceable when applied with correct transformation.",[50,171,173,178],{"title":172},"Risk of downtime",[54,174,175],{"status":62},[22,176,177],{},"Battery and radio issues only — fully within your control.",[54,179,180],{"status":56},[22,181,182],{},"Dependent on mobile data coverage and service uptime.",[12,184,186],{"id":185},"real-cost-comparison","Real cost comparison",[22,188,189],{},"The choice often comes down to economics. Here is a realistic cost model for a professional user working 100 days per year.",[191,192],"cost-comparison",{"additionalstyles":45,"items":193,"title":194,"total":195,"total-label":196},"Second receiver (Emlid RS3 or equivalent)|€2,500||Tripod, pole, radio module|€400||Setup time cost (30 min × 100 days × 3 years × €60\u002Fhr)|€9,000||Maintenance and battery replacement|€300","Own base station — 3-year total cost","~€12,200","3-year total",[191,198],{"additionalstyles":199,"items":200,"title":201,"total":202,"total-label":196,"tone":203},"mt-[30px]","Subscription (€39\u002Fmonth professional plan)|€1,404||No extra hardware|€0||Setup time cost (2 min × 100 days × 3 years × €60\u002Fhr)|€600||Mobile data (typically already included in phone plan)|€0","NTRIP subscription — 3-year total cost","~€2,000","primary",[205,206,209],"card",{"additionalstyles":199,"color":207,"title":208},"orange","The hidden cost of base station setup time",[22,210,211],{},"Setting up and surveying a base station takes 15–45 minutes per day. Over a full working year this adds up to 25–75 hours of non-billable time. At a professional day rate this often exceeds the cost of an NTRIP subscription within the first year.",[12,213,215],{"id":214},"which-is-right-for-your-use-case","Which is right for your use case?",[217,218,219,224,228,232,236,240,244,248],"cards",{"additionalstyles":45},[220,221],"cards-item",{"text":222,"title":223},"Driving between jobs leaves no time to set up a base. NTRIP corrections follow you everywhere within network coverage. No equipment to carry, set up or retrieve.","NTRIP wins — mobile surveyor covering multiple sites per day",[220,225],{"text":226,"title":227},"Working across hundreds of hectares daily. NTRIP covers the entire area without repositioning. Multiple tractors can connect simultaneously with individual subscriptions.","NTRIP wins — precision agriculture on large farmland",[220,229],{"text":230,"title":231},"If you return to the same site every day, a permanent base station on a known point gives maximum traceability and independence from mobile data. NTRIP is simpler and equally accurate for most tasks.","Either works well — large construction site with fixed work area",[220,233],{"text":234,"title":235},"Underground, in forests, at sea or in developing regions where mobile data is unreliable. A base-rover setup with radio link works completely offline.","Own base wins — remote areas without mobile data coverage",[220,237],{"text":238,"title":239},"Both approaches deliver GCP accuracy of 1–3 cm. NTRIP is faster to set up. Own base gives independence from mobile coverage in remote areas.","Either works well — drone mapping with ground control points",[220,241],{"text":242,"title":243},"When the law requires positions traceable to a specific national reference frame point, placing the base on a known monument gives unambiguous traceability.","Own base wins — legal cadastral surveys requiring national reference",[220,245],{"text":246,"title":247},"Managing a base station alone means leaving it unattended. NTRIP eliminates this entirely — one person, one receiver, full RTK accuracy.","NTRIP wins — solo operator",[220,249],{"text":250,"title":251},"One base station serves any number of rovers at no extra cost. With NTRIP, each rover needs its own subscription or concurrent slot.","Own base can win — team of multiple rovers",[12,253,255],{"id":254},"the-practical-answer-for-most-users","The practical answer for most users",[205,257,260],{"additionalstyles":45,"color":258,"title":259},"green","NTRIP is usually the practical choice",[22,261,262],{},"If you have reliable mobile data and work across multiple locations, NTRIP is almost always the more economical and practical choice. The hardware savings alone often pay for several years of subscription. Keep a base station setup as a backup for remote work if needed.",{"title":264,"searchDepth":265,"depth":265,"links":266},"",2,[267,272,273,274,275],{"id":14,"depth":265,"text":15,"children":268},[269,271],{"id":19,"depth":270,"text":20},3,{"id":30,"depth":270,"text":31},{"id":40,"depth":265,"text":41},{"id":185,"depth":265,"text":186},{"id":214,"depth":265,"text":215},{"id":254,"depth":265,"text":255},"learn","learn\u002Fown-base-staation-vs-ntrip-network.webp","Both approaches deliver centimetre-accurate RTK Fix. The right choice depends on how you work, where you work and how often you work. This page gives you everything you need to decide.","md",{},true,"\u002Fen\u002Flearn\u002Fbase-station-vs-ntrip","2026-07-25",[285,286],"\u002Fen\u002Flearn\u002Fwhat-is-ntrip","\u002Fen\u002Flearn\u002Frtk-baseline-length",{"title":6,"description":278},"en\u002Flearn\u002Fbase-station-vs-ntrip",null,"lGC4RVUVL1rEDLaiUVEuLK3PGmoOhYPmliIJsUuvP-4",[],[293,617],{"id":294,"title":295,"author":296,"body":297,"category":276,"cover":610,"description":611,"extension":279,"meta":612,"navigation":281,"path":285,"publishedAt":613,"relatedArticles":289,"seo":614,"stem":615,"updatedAt":289,"__hash__":616},"knowledge_en\u002Fen\u002Flearn\u002Fwhat-is-ntrip.md","What is NTRIP and how does it work?","Wilko",{"type":9,"value":298,"toc":598},[299,303,306,309,329,333,336,360,364,367,371,379,382,386,389,393,433,439,443,446,540,544,562,568,572,575,592],[12,300,302],{"id":301},"what-ntrip-stands-for","What NTRIP stands for",[22,304,305],{},"NTRIP stands for Networked Transport of RTCM via Internet Protocol. Unpacking the name tells you exactly what it does: it takes RTCM correction data — the standard format for RTK corrections — and delivers it over the internet using standard HTTP-based communication.",[22,307,308],{},"NTRIP was developed by the German Federal Agency for Cartography and Geodesy (BKG) in the early 2000s and became the global standard for internet-based RTK correction delivery. Today it is used by every major correction network, every modern RTK receiver and virtually every field survey software package.",[310,311,312,317,321,325],"text-grid",{"additionalstyles":45},[313,314],"text-grid-item",{"text":315,"title":316},"Standard TCP port","2101",[313,318],{"text":319,"title":320},"Protocol base","HTTP",[313,322],{"text":323,"title":324},"Data format carried","RTCM3",[313,326],{"text":327,"title":328},"Correction latency","\u003C1 s",[12,330,332],{"id":331},"the-three-components","The three components",[22,334,335],{},"NTRIP has three distinct roles — caster, server and client — that together form the correction delivery chain. Understanding these helps you configure your equipment correctly and diagnose connection problems.",[337,338,339,344,348,353,356],"flow-diagram",{"additionalstyles":45},[340,341],"flow-card",{"text":342,"title":343},"NTRIP Server","Reference station",[345,346],"flow-connector",{"text":347},"RTCM3 over internet",[340,349],{"text":350,"title":351,":highlighted":352},"Central hub","NTRIP Caster","true",[345,354],{"text":355},"RTCM3 stream on demand",[340,357],{"text":358,"title":359},"NTRIP Client","Your device",[17,361,363],{"id":362},"ntrip-server-the-reference-station-side","NTRIP Server — the reference station side",[22,365,366],{},"The NTRIP Server is the software running at each physical reference station. It reads the raw GNSS observations from the receiver and pushes them continuously to the caster over the internet. A reference station broadcasts its data to the caster 24 hours a day, typically at 1-second intervals. You never interact with the server directly — it operates invisibly in the background.",[17,368,370],{"id":369},"ntrip-caster-the-central-hub","NTRIP Caster — the central hub",[22,372,373,374,378],{},"The NTRIP Caster is the server infrastructure that receives data from all reference stations and distributes it to clients on request. It maintains a sourcetable — a list of all available correction streams (mountpoints) — and authenticates connecting clients. When you enter an NTRIP host address like ",[375,376,377],"code",{},"ntrip.rtksub.com",", you are connecting to a caster.",[22,380,381],{},"A caster can serve thousands of clients simultaneously from the same set of reference stations. This is why network correction services are economically viable — one physical infrastructure serves many subscribers.",[17,383,385],{"id":384},"ntrip-client-your-device","NTRIP Client — your device",[22,387,388],{},"The NTRIP Client is the software on your side — built into Emlid Flow, SW Maps, Trimble Access, FieldGenius and every other modern field application. It connects to the caster, authenticates, selects a mountpoint and receives the correction stream. The client passes the incoming RTCM3 data to the receiver, which uses it to compute an RTK Fix.",[12,390,392],{"id":391},"how-ntrip-works-step-by-step","How NTRIP works step by step",[394,395,396,403,409,415,421,427],"stepper",{"additionalstyles":45},[397,398,400],"stepper-item",{"title":399},"Reference stations observe satellites",[22,401,402],{},"Permanent GNSS receivers at fixed, precisely surveyed locations track all visible satellites continuously. They measure the difference between what the signals should look like at their known position and what they actually receive — this difference is the correction data.",[397,404,406],{"title":405},"Stations stream RTCM3 to the caster",[22,407,408],{},"Each reference station sends its correction data to the NTRIP caster in real time. The data is formatted as RTCM3 messages — the universal standard for RTK corrections. This stream flows continuously, every second of every day.",[397,410,412],{"title":411},"Your client connects and authenticates",[22,413,414],{},"Your field software (the NTRIP client) opens a TCP connection to the caster on port 2101. It sends an HTTP GET request including your username and password. The caster verifies your credentials and confirms the connection.",[397,416,418],{"title":417},"You select a mountpoint",[22,419,420],{},"The caster sends back a sourcetable listing all available correction streams. You select a mountpoint — the name of the specific correction stream you want. Your client sends the mountpoint name back to the caster, which begins streaming that correction data to you.",[397,422,424],{"title":423},"Corrections flow to your receiver",[22,425,426],{},"The caster streams RTCM3 correction messages continuously to your client. Your field software or NTRIP app passes these to your GNSS receiver — typically via Bluetooth, USB or directly over the network if the receiver has its own IP connection.",[397,428,430],{"title":429},"Your receiver computes RTK Fixed",[22,431,432],{},"The receiver combines the incoming corrections with its own satellite observations. It resolves carrier phase ambiguities — the mathematical step that unlocks centimetre accuracy — and outputs an RTK Fixed position. In good conditions this takes 10–60 seconds from the moment corrections begin flowing.",[205,434,436],{"additionalstyles":45,"color":203,"title":435},"NTRIP is essentially streaming audio — but for position",[22,437,438],{},"A useful analogy: NTRIP works like an internet radio stream. The caster is the radio server. Your NTRIP client is the app on your phone. The mountpoint is the station you tune to. Corrections flow continuously as long as you are connected — and like a radio stream, a brief internet dropout interrupts it until the connection re-establishes.",[12,440,442],{"id":441},"ntrip-vs-radio-link","NTRIP vs radio link",[22,444,445],{},"Before NTRIP became widespread, RTK corrections were delivered by UHF radio — a base station on site broadcast corrections to rovers within line-of-sight range. Radio is still used today, but NTRIP has become the dominant method for most professional applications.",[43,447,451,464,477,489,502,515,527],{"additionalstyles":45,"items":448,"label":449,"winner":450},"UHF radio link|NTRIP","UHF radio link compared with NTRIP","NTRIP",[50,452,454,459],{"title":453},"Range",[54,455,456],{"status":56},[22,457,458],{},"2–10 km line of sight. Terrain and buildings block signal.",[54,460,461],{"status":62},[22,462,463],{},"Unlimited within network coverage. Works across an entire country.",[50,465,467,472],{"title":466},"Infrastructure required",[54,468,469],{"status":56},[22,470,471],{},"Base station, tripod, radio module, battery. 15–30 min setup per job.",[54,473,474],{"status":62},[22,475,476],{},"One rover. Mobile data connection. No base station.",[50,478,479,484],{"title":107},[54,480,481],{"status":62},[22,482,483],{},"Yes — fully independent of internet or mobile coverage.",[54,485,486],{"status":56},[22,487,488],{},"No — requires mobile data at the rover location.",[50,490,492,497],{"title":491},"Latency",[54,493,494],{"status":62},[22,495,496],{},"\u003C100 ms — very low latency, ideal for machine guidance.",[54,498,499],{"status":62},[22,500,501],{},"\u003C1 s over 4G — acceptable for all surveying applications.",[50,503,505,510],{"title":504},"Number of rovers served",[54,506,507],{"status":56},[22,508,509],{},"Unlimited — radio broadcast reaches all rovers in range.",[54,511,512],{"status":56},[22,513,514],{},"Each rover needs its own NTRIP connection and subscription.",[50,516,517,522],{"title":94},[54,518,519],{"status":56},[22,520,521],{},"Best within 10 km of base. Degrades at distance.",[54,523,524],{"status":62},[22,525,526],{},"Consistent with VRS across the entire network coverage area.",[50,528,530,535],{"title":529},"Cost",[54,531,532],{"status":56},[22,533,534],{},"High upfront hardware cost. No ongoing fees.",[54,536,537],{"status":62},[22,538,539],{},"Low upfront (one receiver). Monthly subscription for corrections.",[12,541,543],{"id":542},"what-you-need-to-use-ntrip","What you need to use NTRIP",[217,545,546,550,554,558],{"additionalstyles":45},[220,547],{"text":548,"title":549},"Any modern multi-band RTK receiver. Emlid, Trimble, Leica, u-blox ZED-F9P and most others support NTRIP natively.","NTRIP-compatible receiver",[220,551],{"text":552,"title":553},"Built into Emlid Flow, SW Maps, Trimble Access, FieldGenius, Lefebure and most field apps. You are unlikely to need a separate client.","NTRIP client software",[220,555],{"text":556,"title":557},"Mobile data (4G or 3G) at the rover location. A few hundred kilobytes per hour — similar to a basic messaging app.","Internet connection",[220,559],{"text":560,"title":561},"Host address, port (2101), mountpoint name, username and password from your correction service provider.","NTRIP credentials",[205,563,565],{"additionalstyles":45,"color":258,"title":564},"NTRIP data usage is very low",[22,566,567],{},"A typical NTRIP correction stream uses 50–200 KB per hour depending on the mountpoint and number of satellite constellations. Over a full 8-hour working day this is under 2 MB — negligible on any mobile data plan. NTRIP will not meaningfully affect your data allowance.",[12,569,571],{"id":570},"ntrip-v1-vs-ntrip-v2","NTRIP v1 vs NTRIP v2",[22,573,574],{},"There are two versions of the NTRIP standard. Most users will never need to think about this distinction — your software handles it automatically — but it is useful to understand when troubleshooting.",[576,577,578,586],"ul",{},[579,580,581,585],"li",{},[582,583,584],"strong",{},"NTRIP v1"," (2004) — the original standard. Uses basic HTTP 1.0. One-way communication: the caster sends corrections and receives nothing back from the client. Does not natively support GGA position transmission for VRS. Still widely supported by all servers and clients.",[579,587,588,591],{},[582,589,590],{},"NTRIP v2"," (2007) — adds bidirectional communication over HTTP 1.1. Supports GGA transmission from client to caster within the protocol — this is how VRS mountpoints work. Supports chunked transfer encoding for more reliable streaming. Trimble Access automatically negotiates v2 if the server supports it.",[205,593,595],{"additionalstyles":45,"color":207,"title":594},"Force v1 only if you have connection problems",[22,596,597],{},"Some older equipment or network configurations have problems with NTRIP v2 negotiation. If you cannot connect and everything else looks correct, try forcing your client to use NTRIP v1.0. In Trimble Access this is a checkbox in the survey style data link settings. In most other clients, look for an \"NTRIP version\" dropdown.",{"title":264,"searchDepth":265,"depth":265,"links":599},[600,601,606,607,608,609],{"id":301,"depth":265,"text":302},{"id":331,"depth":265,"text":332,"children":602},[603,604,605],{"id":362,"depth":270,"text":363},{"id":369,"depth":270,"text":370},{"id":384,"depth":270,"text":385},{"id":391,"depth":265,"text":392},{"id":441,"depth":265,"text":442},{"id":542,"depth":265,"text":543},{"id":570,"depth":265,"text":571},"learn\u002Fwhat-is-ntrip.webp","NTRIP is the internet protocol that delivers RTK correction data from reference stations to your rover over a mobile data connection. It replaced radio links as the dominant correction delivery method — and it is the reason a single receiver with a SIM card can achieve centimetre accuracy anywhere in a correction network's coverage area.",{},"2026-07-24",{"title":295,"description":611},"en\u002Flearn\u002Fwhat-is-ntrip","zwxVSM1r0uMgUoqabd-awIyiWlIAORHYhZCmNiesBK0",{"id":618,"title":619,"author":296,"body":620,"category":276,"cover":917,"description":918,"extension":279,"meta":919,"navigation":281,"path":286,"publishedAt":283,"relatedArticles":920,"seo":923,"stem":924,"updatedAt":289,"__hash__":925},"knowledge_en\u002Fen\u002Flearn\u002Frtk-baseline-length.md","How far can you be from the base station?",{"type":9,"value":621,"toc":909},[622,626,629,632,650,654,763,767,770,784,790,794,797,800,820,824,827,853,857,863,866,903],[12,623,625],{"id":624},"what-is-baseline-length","What is baseline length?",[22,627,628],{},"The baseline is the straight-line distance between your RTK rover and the reference station providing corrections. In a base-rover setup, that is your own base station. When using an NTRIP correction service, it is the nearest physical reference station in the network.",[22,630,631],{},"The shorter the baseline, the more similar the satellite signals seen by both rover and base — which means corrections are more accurate and Fix is faster. As the baseline grows, atmospheric differences (ionosphere and troposphere) between rover and base increase, making it harder for the receiver to resolve carrier phase ambiguities.",[310,633,634,638,642,646],{"additionalstyles":45},[313,635],{"text":636,"title":637},"Fast Fix, centimetre accuracy","0–30 km",[313,639],{"text":640,"title":641},"Slower Fix — use VRS","30–60 km",[313,643],{"text":644,"title":645},"Fix becomes unreliable without VRS","60–100 km",[313,647],{"text":648,"title":649},"Use VRS or another network solution","100 km+",[12,651,653],{"id":652},"practical-limits-by-setup-type","Practical limits by setup type",[655,656,657,676],"table",{},[658,659,660],"thead",{},[661,662,663,667,670,673],"tr",{},[664,665,666],"th",{},"Setup type",[664,668,669],{},"Recommended max",[664,671,672],{},"Absolute max",[664,674,675],{},"Status",[677,678,679,696,713,730,747],"tbody",{},[661,680,681,687,690,693],{},[682,683,684,686],"td",{},[582,685,20],{}," — Single base, radio or NTRIP",[682,688,689],{},"10–15 km",[682,691,692],{},"~30 km",[682,694,695],{},"Best accuracy",[661,697,698,704,707,710],{},[682,699,700,703],{},[582,701,702],{},"NTRIP network, standard mountpoint"," — Nearest physical station",[682,705,706],{},"20–30 km",[682,708,709],{},"~50 km",[682,711,712],{},"Good in dense networks",[661,714,715,721,724,727],{},[682,716,717,720],{},[582,718,719],{},"NTRIP network, VRS mountpoint"," — Virtual reference station",[682,722,723],{},"Any distance in network",[682,725,726],{},"Network coverage area",[682,728,729],{},"Recommended for >30 km",[661,731,732,738,741,744],{},[682,733,734,737],{},[582,735,736],{},"NTRIP network, no VRS"," — Sparse station coverage",[682,739,740],{},"20 km",[682,742,743],{},"~40 km with degraded accuracy",[682,745,746],{},"Use VRS if available",[661,748,749,755,758,760],{},[682,750,751,754],{},[582,752,753],{},"PPP (Precise Point Positioning)"," — No local base needed",[682,756,757],{},"Global",[682,759,757],{},[682,761,762],{},"Minutes to converge, cm post-fix",[12,764,766],{"id":765},"what-happens-as-baseline-grows","What happens as baseline grows",[22,768,769],{},"Longer baselines introduce three problems that affect RTK performance:",[217,771,772,776,780],{"additionalstyles":45},[220,773],{"text":774,"title":775},"The ionosphere is a layer of charged particles that delays satellite signals. At short baselines, rover and base see nearly identical ionospheric conditions, so corrections cancel out the delay well. Beyond roughly 20–30 km, conditions diverge enough to degrade corrections, especially during high solar activity.","1. Ionospheric decorrelation",[220,777],{"text":778,"title":779},"The lower atmosphere also delays signals based on temperature, pressure and humidity. These vary across terrain. At longer baselines, especially with significant altitude differences between rover and base, tropospheric errors become significant.","2. Tropospheric decorrelation",[220,781],{"text":782,"title":783},"RTK Fix depends on resolving carrier phase ambiguities. At longer baselines, this calculation becomes harder and takes longer, or may not converge at all. The result is Float instead of Fix.","3. Slower ambiguity resolution",[205,785,787],{"additionalstyles":45,"color":207,"title":786},"Watch for this sign",[22,788,789],{},"If you are consistently stuck on Float and your environment is good (open sky, strong signal), long baseline is often the cause. Check the distance to the nearest reference station in your NTRIP sourcetable.",[12,791,793],{"id":792},"how-vrs-solves-long-baselines","How VRS solves long baselines",[22,795,796],{},"VRS (Virtual Reference Station) is a network feature where the NTRIP server computes a synthetic correction stream as if a real base station existed right next to your rover — typically within 1–2 km. It achieves this by interpolating data from multiple physical stations across the network.",[22,798,799],{},"To use VRS, your NTRIP client must send your position (a GGA sentence) to the server. The server uses that position to generate the virtual corrections and streams them back. If GGA is not sent, the VRS cannot generate a local correction and you will receive no data.",[801,802,804,810,815],"requirements",{"additionalstyles":45,"title":803},"VRS setup checklist",[805,806,807],"requirement-item",{},[22,808,809],{},"Enable GGA transmission in your NTRIP client.",[805,811,812],{},[22,813,814],{},"Select a mountpoint labelled VRS, MAC or RTCM3_VRS.",[805,816,817],{},[22,818,819],{},"Ensure you have a Single or Float solution first so GGA contains a valid position.",[12,821,823],{"id":822},"limits-by-device-type","Limits by device type",[22,825,826],{},"Different receivers handle long baselines differently depending on their processing engine and the signals they track.",[217,828,829,833,837,841,845,849],{"additionalstyles":45},[220,830],{"text":831,"title":832},"Multi-band. Use a VRS mountpoint beyond 30 km.","Emlid Reach RS2+ \u002F RS3 \u002F RS4 — ~60 km",[220,834],{"text":835,"title":836},"Pure network rover. VRS is strongly recommended.","Emlid Reach RX \u002F RX2 — ~30 km",[220,838],{"text":839,"title":840},"Advanced engines. VRS or MAC required beyond 30 km.","Trimble \u002F Leica — ~100 km",[220,842],{"text":843,"title":844},"Use an MSM5 mountpoint. Use VRS for longer baselines.","DJI RTK drones — ~30 km",[220,846],{"text":847,"title":848},"Entry-level multi-band receiver. Sensitive to baseline length.","u-blox ZED-F9P — ~20 km",[220,850],{"text":851,"title":852},"Short baselines only. No ionospheric correction.","Single-frequency receivers — ~10 km",[12,854,856],{"id":855},"tips-for-long-baseline-situations","Tips for long baseline situations",[205,858,860],{"additionalstyles":45,"color":258,"title":859},"Use VRS first",[22,861,862],{},"If your NTRIP service offers a VRS or MAC mountpoint, switch to it. This eliminates baseline as a factor entirely and is the single most effective change you can make.",[22,864,865],{},"If VRS is not available or you are using your own base station, these steps help:",[394,867,868,875,882,889,896],{"additionalstyles":45},[397,869,872],{"marker":870,"title":871},"1","Move your base closer",[22,873,874],{},"For own-base setups, the most direct solution is repositioning the base within 10–15 km of your work area.",[397,876,879],{"marker":877,"title":878},"2","Wait for better conditions",[22,880,881],{},"During high solar activity (solar maximum), ionospheric delays increase. Working early morning often gives better results.",[397,883,886],{"marker":884,"title":885},"3","Use a multi-band receiver",[22,887,888],{},"Dual or triple-frequency receivers can model and correct ionospheric delays using the difference between frequencies (L1\u002FL2\u002FL5). Single-frequency receivers cannot.",[397,890,893],{"marker":891,"title":892},"4","Increase initialisation time",[22,894,895],{},"At longer baselines, ambiguity resolution simply takes longer. Give the receiver 5–10 minutes in a stationary position before starting work.",[397,897,900],{"marker":898,"title":899},"5","Check elevation mask",[22,901,902],{},"A 15° elevation mask removes low-elevation satellites that carry the highest atmospheric errors at long baselines.",[205,904,906],{"additionalstyles":45,"color":207,"title":905},"Accuracy degrades with baseline even at Fix",[22,907,908],{},"RTK Fix does not guarantee centimetre accuracy at long baselines. At 50+ km without VRS, horizontal errors of 5–10 cm are common even with a Fix solution. For precision work, always verify with known control points.",{"title":264,"searchDepth":265,"depth":265,"links":910},[911,912,913,914,915,916],{"id":624,"depth":265,"text":625},{"id":652,"depth":265,"text":653},{"id":765,"depth":265,"text":766},{"id":792,"depth":265,"text":793},{"id":822,"depth":265,"text":823},{"id":855,"depth":265,"text":856},"learn\u002Fhow-far-can-you-be-from-the-base-station.webp","Baseline length — the distance between your rover and the nearest reference station — directly affects whether you get RTK Fix, how fast you get it, and how accurate it is. Here is what every RTK user needs to know.",{},[921,922],"\u002Fen\u002Flearn\u002Fwhat-is-vrs","\u002Fen\u002Flearn\u002Fwhat-is-gga",{"title":619,"description":918},"en\u002Flearn\u002Frtk-baseline-length","yeaRAGNaezFD_GcEdCRK8Ash3gctEZjgZw5BfvONNWU",1787304609933]