Why I Now Recommend Wire-Free Robot Mowers

I Tested the Navimow X4 on Genuinely Overgrown Grass

I install robot mowers every week. But every now and then, I set up a proper test — not a showcase lawn, but the kind of garden that actually needs work. For this one, I brought a Navimow X4 to a lawn that hadn’t been touched in a while: long, bent-over grass, the kind where you lose sight of the soil underneath.

What I found confirmed what I already suspected — and added a few things worth knowing. After years of installing both wire-based and wire-free systems, I now exclusively recommend the wire-free approach. The Navimow X4 is the clearest example of how far the technology has come.

Why Wire-Free Changes Everything

Wire-free doesn’t mean effortless. It means the starting point is completely different.

With a traditional wire-based mower, you’re committing hours before the machine ever runs: boundary wire around the entire lawn, staking, trenching, testing — all before the first cut. One mistake in the layout and you’re going back to fix it. That work needs to be done right, and done once.

With wire-free technology, that initial barrier is gone. The concept is called Drop-and-Mow: place the mower on the lawn, open the app, walk the boundary once, and the machine is ready to run. No cable in the ground, no tools required to get started.

What changes isn’t the need for a good setup — it’s what a good setup can look like. Want to adjust the mowing zone after a season? You do it in the app, not with a shovel. Need to add an exclusion zone around a new flower bed? Done in minutes. Have a front and back garden that aren’t physically connected? The X4 handles both as separate zones without any additional infrastructure.

The planning still matters. Getting the zones right, setting the correct cutting heights for your lawn, and building a schedule that keeps the grass in good condition — that’s where experience makes a real difference. The technology just means you’re no longer locked into the decisions you made on day one.

Person holding a mobile phone with the Segway Navimow app visible on the screen

The Navimow X4: What Makes It Different

The X4 is the top model in Navimow’s X series — designed for larger gardens up to 4,000 m² and built for reliable, autonomous mowing without any boundary wire infrastructure.

At the heart of it is EFLS 2.0 (Enhanced Fusion Locating System). It combines Network-RTK GPS, an inertial measurement unit, and a camera into a single positioning system that knows its exact location to within a few centimetres — even on overcast days or in gardens with partial tree cover. This is what makes wire-free mowing genuinely precise.

The boundary is defined entirely via the app using VisionFence technology. Walk the perimeter of your lawn once, and the mower maps it. From there you can define exclusion zones, no-go areas, and separate mowing segments — all without a single centimetre of cable in the ground.

A few things that stand out in practice:

  • Multi-zone support: Manage completely separate areas of your garden independently, with individual schedules per zone.
  • Quiet operation: At around 58 dB, it’s quiet enough to run in the morning without disturbing the neighbours.
  • AI obstacle avoidance: The camera doesn’t just define the boundary — it also helps the mower navigate around objects left on the lawn.
  • Weather-resistant: IP66-rated protection, built for Belgian conditions.

Man in a workshop with a large lawn mower

The Tall Grass Test

A few weeks ago I had the chance to test the Navimow X4 on a lawn that hadn’t been touched in a while. Not slightly long grass — genuinely overgrown terrain, the kind where the blades bend over and you lose sight of the soil underneath.

I wanted to know: can it handle it, and if so, what’s the right approach?

Robotic lawn mower on a grassy area with Navimow branding

Here’s what the lawn looked like before I started:

Grassy field with a fence and trees under a clear sky — overgrown lawn before mowing

And here’s the result after a full mowing cycle:

Mowed grassy area with a fence and trees in the background — lawn after mowing with Navimow X4

The result speaks for itself. But the test taught me a few important things along the way.

What to Watch Out for With Tall Grass

Robot mowers are designed for maintaining a lawn — not reclaiming one. There’s an important distinction there, and ignoring it puts unnecessary strain on the machine and leads to disappointing results.

Here’s what I recommend if you’re starting with an overgrown lawn:

  • Never cut more than one-third at once. This is the golden rule of mowing. If the grass is very long, start at the highest cutting height and work your way down gradually over several sessions — ideally across multiple days.
  • Pre-cut if necessary. If the lawn hasn’t been touched in weeks, do one pass with a regular mower at a high setting first. Starting from an extreme length creates too much clipping volume and can overwhelm the mulching system.
  • Avoid wet and tall at the same time. Wet, long grass clumps together and is much harder to cut cleanly. Wait for dry conditions for the first session if you can.
  • Give it time in the first weeks. The robot’s effectiveness compounds. The first two or three weeks may look uneven — that’s normal. Once it finds its rhythm, the result improves noticeably.
  • Check for clippings buildup. After the first session on tall grass, inspect under the mower and around the charging station. More clippings than usual will accumulate, and you don’t want them blocking the blade mechanism.

None of this is unique to the X4 — it applies to any robot mower. The advantage here is that the app makes it easy to schedule multiple shorter sessions with adjusted cutting heights, rather than trying to solve everything in one go.

Is a Wire-Free Robot Mower Right for You?

If you have a lawn that needs regular maintenance and you want a solution that’s fast to set up, easy to adjust, and genuinely set-and-forget — yes, almost certainly.

If you’re starting from a heavily overgrown garden, expect a short preparation phase before the robot takes over completely. A bit of effort upfront, but once it’s in rhythm, you won’t think about the lawn again.

I’ve been advising on and installing robot mowers for years, and the Navimow X4 is the model I recommend most often for medium to large gardens. Not because it’s the easiest sale — because it consistently delivers the best result for the customer.

Thinking about a Navimow for your garden? I’m happy to advise you on which model suits your situation — and take care of the full installation myself. No guesswork, no hassle, just a ready-to-run robot mower from day one.

Robot Mower Selection & Installation →
1.Do wire-free robot mowers really work without burying a boundary cable?

Yes — modern wire-free robot mowers like the Segway Navimow use EFLS 2.0 technology, combining RTK GPS with visual recognition to navigate with centimetre-level precision. There is no physical boundary wire at all. You draw your mowing zones directly in the app, and the robot learns your garden from there. Olivier at ovdv.be installs and configures these systems across Belgium and can set up your mowing zones correctly from the first day.
2.What happens when a boundary wire breaks — and how often does this actually occur?

Wire breaks are more common than most people expect. A garden fork hitting the cable while planting bulbs, a contractor's spade during renovation work, or a dog deciding the wire is an interesting chew toy — all of these cause the robot to stop with an error code. In Belgian gardens especially, where people dig, extend, and redesign regularly, buried wire is always at risk. Finding and repairing a break typically takes 1 to 2 hours of troubleshooting. With a wire-free system, this problem simply does not exist.
3.How accurate is GPS navigation on a wire-free robot mower in a typical Belgian garden?

The Segway Navimow's EFLS 2.0 system achieves centimetre-level positioning accuracy by combining Network-RTK GPS with visual SLAM. In practice, this means the mower reliably stays within its programmed boundaries and can navigate around flower beds, trees, and garden furniture without physical markers. In Belgian gardens with trees or hedges that partially block the sky, the visual recognition component compensates for any GPS signal gaps.
4.How long does it take to install a wire-free robot mower compared to a traditional one?

A traditional wire-based robot mower installation takes 4 to 6 hours — digging shallow trenches, pinning wire every 20 centimetres, and programming exclusion zones. A wire-free installation like the Segway Navimow typically takes around 1 to 2 hours: no digging, no disruption to the garden, and no risk to existing plants or surfaces. Olivier at ovdv.be handles the full installation and app configuration so the robot is ready to mow on the same day.
5.Can I change the mowing zone of a wire-free robot mower after installation?

Yes — this is one of the biggest practical advantages of wire-free systems. With a traditional mower, changing a boundary means physically digging up and re-routing the wire. With a Segway Navimow, you simply redraw the zone in the app. This is especially useful if you redesign part of your garden, add a raised bed, or want to temporarily exclude an area for seeding or repairs. You can adjust zones yourself at any time, or contact Olivier at ovdv.be for assistance.

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Man operating a lawn mower in a grassy area with trees in the background

Portrait | Author

Olivier Vandevijver


I am the owner of OVDV in Laarne/Kalken and have more than 13 years of experience in the garden machinery sector. I advise, install and maintain robotic mowers from brands including Segway Navimow, STIHL and Honda — always based on the real situation of your garden: size, shape, slopes, obstacles and lawn edges. I also offer independent repair and maintenance of garden machines across different brands. And because a robotic mower can't do everything on its own, I also provide professional lawn edge care — so your garden stays not just automatically mowed, but clean and properly finished.
Learn more about him