For most of the category's history, installing a robot lawn mower meant installing a wire. Someone walked the whole perimeter of the garden with a spool and a bag of pegs, trenched or pinned the cable around every bed and tree, and hoped it was right — because changing it later meant doing it again.
The UNICUT range does not use a perimeter wire. The boundary is defined in software instead, which changes what installation day looks like and, more usefully, what happens the first time the customer wants something different. This article covers how a virtual boundary is actually set, how no-go zones and multiple mowing areas fit in, and where the practical limits sit.
What a virtual boundary actually is
A virtual boundary is a mapped line the mower holds itself inside, stored as coordinates rather than as a physical signal in the ground. It works because the machine knows where it is: GFLS fusion positioning combines RTK satellite positioning, VSLAM visual mapping and AI vision so the mower can place itself accurately enough to treat an invisible line as a real one. If you want the detail on that, see how GFLS fusion positioning works.
The distinction that matters to a buyer is not technical, it is practical. A buried wire is a physical object: to change the boundary you dig it up. A mapped boundary is data: to change it you redraw it.
Defining the mowing area
The boundary is set by walking the mower once around the edge of the area you want cut, guiding it along the line you want it to hold. The path is recorded as it goes and becomes the outer limit of the mowing area.
Two things are worth getting right on that first pass, because they set the standard for every session afterwards.
Walk the line you actually want
The recorded path is the boundary, so walk where the mower should end up, not roughly near it. Along a driveway or patio, hold the line tight to the hard edge; the H3 PRO's 1 cm edge cutting only pays off if the mapped boundary is where the edge really is. Cutting the corner during setup produces exactly the uncut strip the owner will notice first.
Do it in reasonable conditions
Setup is the one moment where positioning quality directly determines the quality of everything that follows. Walking the perimeter in good light, on a day with decent satellite reception, gives the cleanest map. It is not a hard requirement, but a boundary recorded well is a boundary that never needs revisiting.
No-go zones inside the lawn
The outer boundary keeps the mower in the garden. No-go zones keep it away from things inside the garden that it should not cross — a pond, a flower bed, a play area, a newly seeded patch.
These are defined the same way: mark out the area to exclude, and the mower treats it as off-limits and routes around it. Because they are data rather than buried cable, a seasonal exclusion is genuinely practical. A bed can be excluded while it is being replanted and released again a month later, which is a thing almost nobody does with a wired machine because the effort is not worth it.
No-go zones are a separate mechanism from obstacle avoidance and it is worth keeping them distinct when explaining the product. AI vision recognises more than 300 object types and reacts to what it encounters in real time — a pet, a hose, a fallen branch. No-go zones handle things that are not objects at all: an area the mower should never enter even though nothing is physically stopping it. You want both, and they solve different problems.
Multiple zones and passages
Gardens are rarely one continuous rectangle. Front and back lawns are often separated by a path or a side passage, and treating them as one area produces odd routing.
Separate areas can be mapped as distinct mowing zones, with the route between them defined as a passage the mower uses to travel rather than an area it cuts. That keeps coverage sensible in each zone and stops the mower trying to mow a gravel path on its way through.
This is also where rated coverage should be read carefully. The figures for the range — 500 m² for the H5, 800 m² for the H3, 1,200 m² for the H3 PRO and 1,500 m² for the H1 — refer to total turf area, not to a single contiguous shape. A 900 m² garden split across three zones is still 900 m² of grass to cut.
Changing a boundary later
This is the part that most clearly separates a mapped boundary from a buried one, and it is the argument worth putting in front of a customer.
Gardens change. A new bed goes in, a trampoline arrives for the summer, a patio gets extended, a tree comes down. With a wire, each of those is a small excavation job. With a mapped boundary, it is a redraw: adjust the affected section, leave the rest alone, and the mower works to the new map on its next session.
Practically, this is also what makes the product survive an owner's changing mind. The most common reason a wired robot mower ends up unused is not that it broke — it is that the garden changed, the boundary became wrong, and nobody wanted to re-trench the cable.
What keeps running once the map is set
Once the boundary exists, the value proposition is that nobody has to think about it again. Rain sensing returns the mower to the dock and resumes the job once conditions allow, rather than leaving a half-cut lawn. Operation stays under 59 dB, which is what makes early-morning or evening scheduling acceptable on a shared boundary. The IPX6 rating covers the weather exposure that comes with living outdoors. OTA updates mean behaviour can improve after the sale rather than being fixed at the shipping version.
None of that matters if the boundary is wrong, which is why the walk-the-perimeter step deserves more care than it usually gets. Everything downstream inherits it.
For brands and distributors
Boundary-free setup removes the single biggest friction point in selling a robot mower: the installation. There is no wire to lay, no trenching, no installer visit to schedule, and no “what happens when I change the garden” objection you cannot answer well.
That reframes the sales conversation from an installation project into a product purchase — worth building your positioning around if you are taking the range to market under your own brand.
FAQ
How is the boundary set without a wire?
You walk the mower once around the edge of the area you want cut. The path is recorded as it goes and becomes the outer limit of the mowing area, stored as coordinates rather than as a cable in the ground.
Are no-go zones the same as obstacle avoidance?
No, and it is worth keeping them separate. No-go zones are mapped areas the mower never enters, such as a pond or a replanted bed. Obstacle avoidance is real-time: AI vision recognises more than 300 object types and reacts to what it encounters during a session.
Can the boundary be changed after installation?
Yes — that is the main practical advantage over a buried wire. Adjust the affected section of the map and leave the rest alone; the mower works to the new boundary on its next session, with no digging.
Does rated coverage assume one continuous lawn?
No. The ratings — 500 m² for the H5, 800 m² for the H3, 1,200 m² for the H3 PRO and 1,500 m² for the H1 — refer to total turf area. A garden split into several zones still counts the sum of the grass.
