A launch monitor measures the physical properties of ball impact and translates them into data your simulator software can use. Understanding what's actually being measured — and how — helps you interpret your numbers and set realistic expectations for your setup.
What happens at impact
In the fraction of a second when the club face contacts the ball, several things happen simultaneously: the ball compresses and releases, it launches at a specific angle and speed, it begins spinning, and it starts curving based on that spin. A launch monitor captures as many of these properties as possible.
The challenge is that impact happens too fast for conventional cameras to capture cleanly. Launch monitors solve this with one of two approaches: high-speed cameras that take thousands of frames per second, or Doppler radar that tracks the ball through its initial flight path.
How camera monitors work
Camera-based monitors use two or three high-speed cameras positioned to the side of the ball. When you swing, the cameras capture the ball at the exact moment of impact — before it's even a foot away from the club face. From those images, the software calculates ball speed, launch angle, launch direction, spin rate, and spin axis.
Because camera monitors measure at impact rather than tracking ball flight, they work in short rooms. The ball only needs to travel a few inches for the cameras to capture enough data. This is why camera monitors are the standard recommendation for home simulator bays with limited depth.
The limitation is club data. Cameras positioned for ball measurement have a restricted view of the club head, so club path, face angle, and attack angle are either estimated or require additional hardware to measure accurately.
How radar monitors work
Radar monitors sit behind the golfer and emit a Doppler radar beam that tracks the ball through its flight path. By analysing how the radar signal changes as the ball moves, the system calculates ball speed, launch angle, spin rate, and carry distance.
Radar needs the ball to travel — typically 8–10 ft minimum — to generate enough data points for accurate measurement. This is why radar monitors don't work well in short rooms. They also work outdoors without any modification, which makes them useful for dual indoor/outdoor setups.
The advantage of radar is club data. Because the radar can track both the ball and the club head during the swing, premium radar systems (Trackman, FlightScope) produce highly accurate club path and face angle measurements. Entry-level radar monitors estimate these values.
How overhead monitors work
Overhead monitors mount to the ceiling above the hitting area and use downward-facing cameras to capture both the ball and club head during the swing. Because they see the full swing from above, they can measure club data — path, face angle, attack angle — with high accuracy.
The ceiling mount means no daily alignment. The monitor stays in position permanently and you simply walk in and start hitting. For dedicated simulator rooms used frequently, this is a meaningful workflow advantage over side-mounted systems that require repositioning.
What the numbers mean
| Measurement | What it means | Typical range (driver) |
|---|---|---|
| Ball speed | Velocity of ball leaving face | 120–180 mph |
| Launch angle | Vertical angle at launch | 10–15° (driver) |
| Spin rate | Ball revolutions per minute | 2,000–3,500 rpm (driver) |
| Smash factor | Ball speed / club head speed | 1.45–1.50 (driver) |
| Carry distance | Distance ball travels in air | 200–300 yards |
Estimated vs measured data
Not all launch monitors measure everything directly. Entry-level monitors often measure ball speed and launch angle accurately but estimate spin rate from ball flight trajectory. This produces data that's close enough for recreational simulator use but less reliable for fitting or swing coaching work.
Premium monitors measure spin directly — either through image analysis (camera monitors) or with the help of metallic stickers on the ball (some radar monitors). The difference is most noticeable on shots with unusual spin, like a blocked shot with low spin or a high-spin wedge.
For most home simulator users, the estimated data from entry-level monitors is accurate enough to enjoy the simulation experience and track improvement over time. For golfers using the simulator for structured practice with swing coaching, measured spin data from a premium monitor is worth the investment.
Frequently asked questions
- Do I need ball stickers?
- Only if your monitor requires them. The Mevo Gen 2 uses metallic stickers for accurate spin measurement indoors. Camera monitors (SkyTrak Plus, Bushnell Launch Pro, Foresight GC3) don't need stickers. Radar monitors like the Garmin R10 estimate spin and don't use stickers.
- How accurate are home launch monitors compared to Trackman?
- For ball speed and carry distance, mid-range monitors are within 1–3% of Trackman on a well-struck shot. Spin measurement diverges more on mishits. For recreational simulator play, the difference is not meaningful. For professional fitting, it is.
- Why does my simulator shot not match what I see on the course?
- Several factors contribute: indoor hitting conditions differ from outdoor, the mat surface affects spin differently than grass, and simulator physics models simplify real-world conditions. The data is accurate — the translation to on-course performance involves additional variables that any simulator approximates rather than replicates exactly.
We've done the research. Here are our recommendations by room size and budget.