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A launch monitor is a device that measures the ball (and often the club) at impact and in the first part of the flight, then calculates where the shot would have gone. It reports numbers like ball speed, launch angle, spin and carry distance, and with software it becomes the engine of a golf simulator. Most launch monitors use one of two technologies, Doppler radar or high-speed cameras, and many newer units combine both.
Which technology a unit uses decides where it works best, how much room it needs and how much of its data is measured versus estimated. That's what this guide explains.
What a launch monitor measures
Every launch monitor starts from the same few facts about impact:
- Ball speed: how fast the ball leaves the face.
- Launch angle: how steeply it climbs.
- Launch direction: left or right of the target line.
- Spin rate and spin axis: how much the ball spins and which way it tilts, which controls height and curve.
- Club data (on many units): club speed, attack angle, club path, face angle.
From those, the software calculates carry, total distance, apex, descent angle and side carry. Even premium units calculate flight results rather than watch every yard of it indoors. Rapsodo spells this out for its MLM2PRO and MLM2XPRO: the device measures ball speed, launch angle and direction, club speed, attack angle and club path (plus spin with its RPT balls), and calculates carry, total distance, apex, descent angle and side carry from those measurements and your elevation.
For what good numbers look like, see our guide to driver launch angle and launch monitor numbers.
How radar launch monitors work
A Doppler radar unit sends out radio waves and listens for the echo. When the waves bounce off a moving object, their frequency shifts; the size of the shift reveals the object's speed and direction. Point that at a golf ball and you can track it.
Where radar shines: outdoors. With open sky, a radar unit can follow a long stretch of the ball's flight and measure more of it directly. That's why radar units are the classic driving range tool.
Where radar struggles: short indoor setups. When the ball hits a net 8 feet away, the unit has only a brief window of flight. Spin in particular is harder to read, and indoor readings become more dependent on algorithms. Some makers work around this: FlightScope recommends aluminum stickers or Titleist RCT balls indoors for accurate spin with its Mevo Gen2.
Placement: radar units usually sit behind the ball, aimed down the target line. Garmin places the R10 6 to 8 feet behind the tee, FlightScope places the Mevo Gen2 about 8 feet behind, and Voice Caddie places the SC4 Pro about 5 feet behind. That space adds to your room depth.
Examples: Garmin Approach R10, Voice Caddie SC4 Pro, Shot Scope LM1.
How camera-based launch monitors work
A camera-based (photometric) unit takes a rapid series of high-speed images of the ball at impact. By comparing the ball's position and rotation between frames, it measures speed, launch, direction and spin directly, then models the flight. Some units also photograph the clubhead for club data.
Where cameras shine: indoors. They don't need the ball to fly far, so a net or screen a few feet away doesn't hurt the reading. Most camera units sit beside the ball, which saves the depth radar needs behind you. SkyTrak notes its launch monitor sits next to the ball while other units need up to 8 feet behind the hitting area.
Where cameras struggle: bright sun can interfere. SkyTrak and Square Golf both warn against direct sunlight on the lens outdoors. Some camera units need marked balls or stickers for spin: Square Golf's Home Edition needs its marked balls for spin, and Rapsodo's Impact Vision camera reads the pattern on RPT balls.
Examples: Square Golf Home and Omni Editions, Garmin Approach R50, Foresight GC3.
Hybrids: radar plus camera
Many newer units combine both technologies to cover each other's weak spots:
- SkyTrak ST MAX and SkyTrak+: a photometric camera plus dual Doppler radar, sitting beside the ball. SkyTrak's listings describe the radar capturing club data and the camera handling ball flight.
- FlightScope Mevo Gen2: Doppler radar plus high-speed optics (FlightScope's Fusion Tracking), behind the ball.
- Rapsodo MLM2PRO and MLM2XPRO: cameras plus Doppler radar, behind the ball, with spin from the impact camera and RPT balls.
Radar vs camera at a glance
| Radar | Camera (photometric) | Hybrid | |
|---|---|---|---|
| How it measures | Doppler shift of radio waves | High-speed images at impact | Both |
| Typical placement | Behind the ball | Beside the ball | Either, depending on model |
| Best environment | Outdoors, full flight | Indoors, short rooms | Both |
| Indoor depth needed | About 14–16 ft (unit + flight) | From about 10 ft with a net (SkyTrak) | Depends on placement |
| Spin indoors | Harder; stickers or special balls help | Read directly at impact (some need marked balls) | Usually camera-assisted |
| Sunlight | Not an issue | Can interfere outdoors | Varies |
| Examples | Garmin R10, Voice Caddie SC4 Pro | Square Golf, Garmin R50, Foresight GC3 | SkyTrak ST MAX, Mevo Gen2, Rapsodo MLM2PRO |
Which type should you buy?
Work through these questions in order:
- Where will most of your swings happen? Mostly the range: lean radar. Mostly a home net or screen: lean camera or hybrid.
- How deep is your room? Under about 14 feet, a radar unit behind the ball won't fit; choose a side-of-ball camera unit. Check with our room size calculator.
- How much do you care about spin indoors? If you want convincing curve in a simulator, prefer units that read spin at impact or use marked balls or stickers.
- Will you pay a subscription? Several brands lock courses or key metrics behind yearly plans. Factor that in.
Then pick a model from our best golf launch monitors guide, or from our under-$1,000 picks if budget is the main limit.
Common misconceptions
- "Launch monitors measure carry." They calculate it from launch conditions. That's normal, and good units do it well.
- "Radar doesn't work indoors." It does, with enough depth: about 14 to 16 feet for most units. It just has less flight to read.
- "Camera units are always more accurate." Indoors they often have an edge on spin; outdoors, radar sees more real flight. Accuracy also depends on setup, alignment and the balls you use.
- "More metrics means a better unit." A long list of calculated numbers isn't the same as measuring the key ones well. Look at what's measured.
For a closer look at how simulators turn this data into a shot on screen, see our guide on how accurate golf simulators are, and our SkyTrak+ review for a hybrid in practice.
FAQ
What does a golf launch monitor do?
It measures what happens at and just after impact (ball speed, launch angle, launch direction, spin and, on many units, club speed and path) and uses those numbers to calculate carry, total distance, apex and curve. Paired with software, the same data drives a golf simulator.
Is a camera-based launch monitor better than radar?
Indoors it usually is, because it reads the ball at impact and doesn't need a long flight or space behind the ball. Outdoors, radar has the edge because it can track much more of the real flight. Hybrids that combine both aim to get the best of each.
How does a Doppler radar launch monitor work?
It sends out radio waves and measures how their frequency shifts when they bounce off the moving club and ball. That shift reveals speed and direction. The longer it can track the ball, the more it can measure directly, which is why radar units like open ranges.
Do launch monitors measure or calculate carry distance?
They calculate it. Even premium units measure launch conditions (speed, launch angle, direction, spin) and then model the flight. Rapsodo, for example, says its devices measure ball speed, launch, club speed, attack angle and club path, and calculate carry, total distance, apex and descent from them.
Do I need special balls for a launch monitor?
Some units need them for spin. Rapsodo uses RPT balls, Square Golf uses marked balls, and FlightScope recommends aluminum stickers or Titleist RCT balls indoors. Garmin's R10 is designed for regular golf balls.