Choose a robot mower's navigation type by your yard's sky view and layout: satellite RTK suits open lawns, camera vision and LiDAR cope better near trees and buildings, and a buried boundary wire remains the most predictable option for heavily shaded or oddly shaped yards. Many current mowers combine two systems, which usually gives the most reliable coverage.
Safety first: A robot mower has real, sharp, fast-spinning blades. Keep children, pets, and visitors off the lawn whenever it is scheduled to run, never let anyone ride, sit on, or play with it or its charging dock, mow in daylight only, and never lift, tip, clean, or clear it until you have stopped it, used its disabling key or PIN, and waited for the blades to stop. Stay inside the slope limit printed in your manual. Your manual's instructions always come before anything in this guide.
The four navigation types at a glance
| Navigation type | How it finds its way | Suits | Weak spots | Setup effort |
|---|---|---|---|---|
| Boundary wire | Follows a low-voltage wire pinned or buried around the lawn | Heavy shade, complex edges, yards that rarely change | Wire can be cut by digging or aerating; changes mean moving wire | Highest; wire must be laid by hand or with a cutter |
| RTK satellite | Satellite positioning corrected by a base station or network | Open lawns with a clear view of the sky | Accuracy can drop under dense canopy and beside tall walls | Moderate; mount an antenna or join a network, then map in an app |
| Camera vision | Cameras and onboard software recognize grass, edges, and obstacles | Defined edges, yards with some shade | Needs daylight; can struggle where grass meets similar-looking ground | Low to moderate |
| LiDAR | Laser scanning builds a map of trees, walls, and structures | Yards with trees, sheds, and tight corners | Open lawns with few features give it less to measure against | Low to moderate |
An independent market survey of 21 current US robot mowers found that 19 no longer need a boundary wire, so wire-free navigation is now the norm rather than a premium feature.
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A boundary wire mower stays inside a loop of wire around your lawn. It does not depend on satellites or light, which makes it steady under thick trees. The trade-offs are installation and upkeep: you must lay the wire around every edge and obstacle, and a spade, edger, or aerator can cut it. Wired mowers also tend to mow in random patterns rather than straight lines.
RTK satellite: precise under open sky
RTK, short for real-time kinematic positioning, corrects ordinary satellite positioning to within a few centimeters. You map the boundary by walking or driving the mower around it in an app, and redrawing zones later takes minutes. RTK mowers mow in neat parallel lines. Their weak point is sky view: under heavy canopy, beside a tall house wall, or in a narrow side yard, the signal can drop and the mower may pause until it reconnects.
Camera vision: reading the lawn
Vision mowers use cameras to tell grass from paving, beds, and obstacles. Many need little or no boundary mapping in yards with clear edges. Because they rely on light, they are daytime machines, which suits the daytime-only schedule wildlife experts recommend anyway. Blurred edges, such as grass running into gravel or mulch, can confuse them.
LiDAR: mapping by laser
LiDAR mowers scan their surroundings with lasers and position themselves against fixed features such as trunks, fences, and walls. That makes them strong in yards with trees and structures where satellite signal weakens. In wide open lawns with few landmarks, they have less to work with, which is why many combine LiDAR with RTK.
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Search for the navigation type that suits your yard, then check each listing's rated area, slope limit, and safety features. We may earn a commission at no extra cost to you.
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How to choose for your yard
- Mostly open sky, simple shapes: RTK, or RTK combined with vision.
- Scattered trees, sheds, and a house wall on one side: LiDAR or a combined RTK and LiDAR or vision system.
- Heavy canopy over much of the lawn: a boundary wire, or a multi-sensor system with strong shade performance in its specifications.
- Several separate lawns: any wire-free type with multi-zone support and a clear path between zones.
Navigation is only one part of the decision. Our guide to choosing a robot mower for a small yard covers sizing, slopes, and features.
Keeping navigation reliable
- Keep camera lenses and sensors clean, following the manual.
- Remap after you add beds, paths, or structures.
- For wired systems, mark the wire route so nobody digs through it, and keep a repair kit on hand.
- Place an RTK antenna where the manual recommends, usually high with a clear view of the sky.
Robot mower safety: blades, children, pets, wildlife, and slopes
Treat a robot mower with the same respect as any power mower. Its blades are smaller, but they are sharp, they spin fast, and they can cut skin, paws, and small animals.
- Children. Keep children off the lawn whenever the mower is scheduled to run, not just while you can see it moving. Never let a child ride, sit on, chase, or lift the mower, and do not let children play near the charging dock. Use the child lock or PIN so it cannot be started from the unit.
- Pets. Bring dogs and cats inside or fence them away from the mowing area during every run. Obstacle sensors reduce risk; they do not replace keeping animals off the grass. Some dogs chase or bite moving machines, which puts both the dog and the mower at risk.
- Wildlife. Laboratory tests on 18 robot mower models found that none reliably detected very small young hedgehogs before touching them, and some caused serious injury. The researchers recommend daytime-only schedules. Walk the lawn before the first run of the day and look for young rabbits, fledglings, toads, and turtles, and never schedule mowing at dusk, at night, or at dawn.
- Blades and maintenance. Before you lift, tip, clean, or change blades, press stop, use the disabling key or PIN, and wait for the blades to stop completely; they keep turning briefly after the motor shuts off. Wear sturdy gloves when handling blades.
- Thrown objects. Pick up sticks, stones, toys, dog bowls, hoses, and fallen fruit before each run so the blades cannot throw or catch them.
- Slopes and edges. Never run a mower past the slope limit in its manual, and allow extra margin on wet or freshly watered grass, where wheels slip and units can slide or tip. Keep the mowing boundary well back from drop-offs, retaining walls, ditches, ponds, and pools. Leave very steep banks to a different solution.
- Weather and theft. Pause mowing in heavy rain or lightning, and turn on the anti-theft alarm and PIN so nobody can start the mower or carry it off.
This guide is general information, not a substitute for your mower's manual. Follow the manufacturer's safety instructions for your exact unit wherever they differ from anything here.
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Spare blades and a boundary wire repair kit keep a robot mower running. Match parts to your manual. We may earn a commission at no extra cost to you.
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Frequently asked questions about robot mower navigation
Which navigation type copes most reliably under trees?
Boundary wire and LiDAR are usually the most dependable under trees. Satellite-only systems can lose accuracy under dense canopy.
Do wire-free mowers need internet?
It depends on the mower. Some need a connection for setup, mapping, or network RTK corrections; check the requirements before you buy.
Can I switch from a wired mower to a wire-free one?
Yes. You can leave the old wire in the ground, though pulling exposed sections keeps it from catching tools.
Does navigation type affect safety?
Navigation keeps the mower in bounds; it is not a safety system for people or animals. Keep children, pets, and wildlife off the lawn whatever the mower uses.
Bottom line
Match navigation to your sky view: RTK for open lawns, LiDAR or vision near trees and buildings, and a boundary wire for heavy shade. Then size the mower to your lawn and slope, and run it in daylight only. For mowing heights by grass type, see our lawn mowing guide.