Category: Networks

The first time I keyed up on a live ATC frequency, I had my flight plan filed, my charts open, and absolutely no idea what to actually say. I stumbled through a clearance request that probably sounded like I was reading a ransom note, and the controller – patiently – talked me through it. Years later I still remember that mix of embarrassment and adrenaline. If you’re about to make that same first call, here’s the phraseology grounding I wish someone had handed me before I connected.

Phraseology is a shared language, not a script

The point of standard phraseology isn’t to sound official for its own sake. It exists so that a controller and a pilot who have never met, speaking under time pressure, can exchange safety-critical information without ambiguity. “Cleared to land” means something very specific and different from “continue approach” or “cleared for the option,” and mixing those up matters. Once you think of phraseology as a shared, load-bearing vocabulary rather than a performance, it gets much easier to learn – you’re not memorizing flavor text, you’re learning the actual words the system runs on.

Both major online networks base their procedures on ICAO phraseology with regional variations, and both publish training material aimed specifically at this problem. VATSIM has a structured pilot training track that walks new members through exactly this, and IVAO runs a similar program through its training division. Neither expects you to arrive fluent.

The building blocks: callsign, readback, standard words

Every transmission starts and usually ends with your callsign. Controllers are working multiple aircraft simultaneously and the callsign is how they route instructions correctly in their head – drop it and you create confusion even if your message was otherwise perfect. State who you are, then what you have or want, then close with your callsign again on longer exchanges.

Readbacks are not optional politeness – they’re the error-catching mechanism of the entire system. When a controller issues an altitude, heading, frequency change, or clearance, you read it back close to verbatim. This is how a controller catches it if you heard “descend and maintain three thousand” as “descend and maintain thirteen thousand” before it becomes a real problem. Get comfortable reading back numbers precisely: altitudes, headings, squawk codes, and runway assignments all get repeated back, not paraphrased.

A handful of standard words carry specific legal weight: “affirm” and “negative” instead of yes and no, “roger” meaning only “I received your last transmission” (not “I agree” or “I will comply”), and “wilco” meaning “I received it and will comply.” Mixing “roger” and “wilco” up is a classic beginner tell, and it’s worth drilling until it’s automatic.

Ground, tower, approach, and center each have their own rhythm

Ground control phraseology is mostly about taxi instructions – “taxi to runway two-seven via alpha, hold short of bravo” – and you read back any hold-short instruction without exception, since that’s a runway incursion risk if missed. Tower phraseology centers on takeoff and landing clearances, and it moves fast, especially at busy fields, so keep your transmissions short and expect brief acknowledgments in return.

Approach and center work in a longer time horizon – vectors, altitude changes, frequency handoffs – and the phraseology reflects that: “turn left heading two-four-zero, descend and maintain five thousand, expect vectors ILS runway two-eight left.” It’s more information per transmission, so listening for the full instruction before keying up to read it back matters more here than anywhere else.

The mistakes almost everyone makes early on

• Keying up before finishing the thought, then trailing off mid-sentence while still transmitting
• Reading back everything the controller said, including non-instructional chatter, which clutters the frequency
• Using “please” and conversational filler instead of standard phraseology – it’s not rude to skip it, it’s expected
• Forgetting to state your position or intentions on an uncontrolled field’s common frequency when there’s no controller to prompt you
• Panicking and going silent when a clearance doesn’t parse instead of asking the controller to “say again”

That last one is worth internalizing early: “say again” is a completely normal, expected transmission. Controllers would much rather repeat an instruction than have a pilot guess at one they didn’t fully catch.

Building fluency before you go online

You don’t need to learn this cold on a live frequency with real people listening. LiveATC.net archives real-world frequencies so you can listen to actual traffic patterns and absorb the rhythm passively. The SKYbrary reference on standard phraseology is a solid, concise breakdown of standard phrases if you want the reference material rather than just examples. And both VATSIM and IVAO let you fly at quiet hours on lightly staffed airports, which is a genuinely good way to get a few low-pressure exchanges under your belt before you attempt a busy fly-in event.

Nobody expects a new pilot to sound like a twenty-year airline captain on their first online flight. Controllers who staff these networks are volunteers who got into this because they enjoy working with pilots, including new ones still finding their footing. Stumble through it, ask for “say again” when you need to, and it clicks faster than you’d expect – usually within your first three or four sessions.

At some point in every simmer’s journey, the skies stop feeling big enough alone. You want ATC that actually responds, traffic that behaves like real traffic, and the slight nervous energy of knowing a real person is watching your approach on radar. That’s the moment you look at VATSIM and IVAO and have to decide which one to join first. I’ve spent serious time on both networks. Here’s what I actually think.

The basics: what both networks offer

VATSIM (Virtual Air Traffic Simulation Network) and IVAO (International Virtual Aviation Organisation) both do the same fundamental thing: they connect flight simulation pilots with volunteer ATC controllers in a shared online environment. You load your simulator, connect a client, and suddenly you’re sharing airspace with hundreds of other pilots flying real procedures under simulated ATC service.

Both networks are free to join. Both support the major simulators – MSFS, X-Plane, and Prepar3D. Both have a training program for pilots new to online flying, and both have an ATC training pathway for members who want to staff controllers positions. At the surface level, they’re more similar than different.

VATSIM: the larger network

By raw numbers, VATSIM is bigger. On a busy Friday evening, you’ll find several thousand pilots connected simultaneously, with ATC coverage across every major region. The US and European hubs – the big ones like EGLL (Heathrow), KLAX (Los Angeles), KJFK (New York), EGCC (Manchester) – reliably have top-down coverage during peak hours.

That size advantage translates directly into the experience at major airports. Flying into EGLL on a VATSIM UK fly-in event feels genuinely immersive – you’re number twelve for the ILS, holding over LAM, listening to a controller who sounds like they know exactly what they’re doing. The community that built up around VATSIM is enormous, which means there are also more tutorials, more YouTube guides for using the client software, and more forum posts answering whatever beginner question you have.

The tradeoff is that outside peak hours or outside major hubs, coverage thins out. Flying a regional route in Southeast Asia on a Tuesday morning, you’re often flying with no ATC online. That’s not a failure of the network – it’s just math. Volunteers staff the positions they find interesting, and the interest concentrates around major airports.

IVAO: structured, global, detailed

IVAO has a different character. The network is smaller but has a stronger presence in certain regions – particularly South America, the Middle East, and parts of Asia-Pacific where VATSIM coverage is thinner. If you’re flying routes that touch those areas regularly, IVAO’s ATC coverage there can actually be better on average.

IVAO also has a reputation for a more structured training program and stricter standards in some divisions. The rating system is more granular – there are more steps between “new pilot” and “rated instrument pilot” – which some people find motivating and others find bureaucratic. The controller training is similarly detailed, which tends to produce a consistent quality of service when controllers are online.

The software ecosystem around IVAO has modernized significantly with their Aurora client and IvAp successor, and the map and statistics tools at ivao.aero are genuinely good. IVAO also tends to run well-organized division-level events that draw concentrated traffic to specific regions.

The pilot experience: connecting and flying

On VATSIM, the primary pilot client is vPilot for MSFS/P3D and X-Pilot for X-Plane. Setup is straightforward – register on the VATSIM website, download the client, enter your credentials, and connect. The recommended starting point is to get a basic pilot rating by reading the documentation and passing a short online test.

IVAO uses its own client software. The connection process is similar. Both networks provide a map view showing live traffic, and both have flight planning integration that lets you file a flight plan before connecting – a requirement if you’re going to operate under IFR on either network.

From a practical standpoint, the day-to-day experience of flying on either network under active ATC is very similar. The phraseology conventions are close (both follow ICAO standards with some variations), the procedures are recognizable, and the general quality of service from experienced controllers is comparable. New pilots will barely notice a difference once they’ve learned the basics.

Which one should you start with

My honest answer is VATSIM for most people, specifically because of the larger community and the better chance of finding ATC coverage on your first few flights. The learning curve for online flying is real – working with live ATC for the first time is nerve-wracking even when you know the procedures – and having more active controllers and more community support makes that curve less steep.

That said, there are legitimate reasons to start with or add IVAO: you fly routes where IVAO has better regional coverage, you prefer a more structured training pathway, or you’ve found that the specific virtual airline you want to join operates primarily on IVAO. Some larger VAs fly exclusively on one network or the other, and if the community matters as much as the network, that’s the deciding factor.

Nothing stops you from having accounts on both. The clients don’t conflict, your logbook systems are separate, and many simmers switch between them depending on where coverage is better for a given flight. Think of them as two venues for the same hobby, not competing religions.