Updated 8 May 2026

RTK GPS vs Perimeter Wire vs LiDAR — Which Boundary Method Should You Choose?

Before you buy a robot lawn mower, you have to choose how it knows where to mow. There are three current options: perimeter wire, RTK GPS, and LiDAR (with optional vision). Each works completely differently. Pick wrong and you'll waste a weekend installing wire you didn't need — or buy a $2,500 RTK mower for a yard where the trees block satellite signal.

This guide breaks down all three. By the end you'll know which fits your yard.

Method 1: Perimeter wire (the original method)

The mower learns the boundary of your lawn from a thin wire buried (or pegged) around the perimeter. The wire creates a low-voltage magnetic loop the mower's onboard sensor detects. When it crosses the loop, it turns around.

Pros

• Reliable in tree-heavy yards — works without sky view; trees and buildings don't block anything.
• Mature technology — Husqvarna has refined it since 1995. Edge cases are well-understood.
• Excellent slope handling — wire-guided mowers like the Husqvarna 415X handle 40% slopes; the 450XH handles 70% slopes.
• Works without Wi-Fi — some models (Honda Miimo, older Husqvarnas) operate fully offline.

Cons

• Installation — laying 200–500 metres of wire takes 4–8 hours of work. You can pay an installer $300–$800 depending on yard size.
• Modification difficulty — added a garden bed? Need to re-route the wire. Can be a half-day's work.
• Wire damage — aerator spikes, pruning, garden tools, and wildlife can all sever the wire. Diagnosing breaks takes patience.
• "Looks ugly" until it grows in — for the first 2–3 weeks, you'll see the wire on the surface. After that, grass grows over it.

Best for

• Tree-heavy yards (RTK GPS struggles under canopy)
• Steep slopes (most wire mowers handle 35%+)
• Set-and-forget operators (install once, never think about it)

Wire-method examples in our database

• Husqvarna Automower 415X — 40% slope, 1500 sqm, $2,400 MSRP
• Worx Landroid L1500 — 35% slope, 1500 sqm, $1,799 MSRP
• Honda Miimo HRM310 — 25% slope, 3000 sqm, $2,799 MSRP
• Gardena Sileno Life 1000 — 35% slope, 1000 sqm, $1,399 MSRP

Method 2: RTK GPS (wire-free)

RTK = Real-Time Kinematic positioning. The mower uses satellite GPS, but corrects for typical GPS error (1–3 metres) by also receiving signal from a fixed antenna ("base station") at your house. Result: centimetre-level positioning. The mower knows exactly where your boundaries are because you walked them once during setup.

Pros

• No wire installation — setup takes 30–60 minutes (mostly walking the boundary with the mower).
• Easy reconfiguration — drag a virtual boundary in the app to add a no-go zone, no digging.
• Multi-zone capable — most RTK mowers support several lawn areas without separate wire installations.
• Cleaner aesthetics — nothing buried, nothing visible.

Cons

• Needs sky view — under heavy tree canopy, RTK signal degrades. Walls and houses partially block line-of-sight to satellites.
• Slope ratings vary widely — Navimow tops out at 24%; Mammotion LUBA 2 reaches 75%. Check the spec carefully.
• Wi-Fi required — for the base station to receive correction data and the mower to phone home.
• Higher cost — RTK mowers typically start at $1,200; wire mowers start at $600.

Best for

• Open lawns with clear sky view
• Yards that change layout often (gardens added/removed)
• Operators who want install-and-go simplicity

RTK examples in our database

• Mammotion LUBA 2 AWD 3000 — 75% slope, 3000 sqm, $3,499 MSRP
• Husqvarna Automower 450XH EPOS — 45% slope, 5000 sqm, $5,500 MSRP
• Segway Navimow i108N — 24% slope, 800 sqm, $1,199 MSRP
• Anthbot Genie 3000 — 30% slope, 3000 sqm, $1,499 MSRP

Method 3: LiDAR + Vision (the newest method)

LiDAR-equipped mowers use laser sensors to map the environment in real time. Combined with optical cameras (vision), they can detect obstacles, pets, kids, irregular garden borders — without GPS or wire. Some hybrid systems combine LiDAR with RTK for reliability under canopy.

Pros

• Works under tree canopy — doesn't depend on satellites.
• Live obstacle avoidance — sees a child or pet entering the yard, avoids them. Useful for unpredictable household environments.
• Detects garden bed edges — flowering rosemary borders, irregular paths, garden art — all detected without manual setup.

Cons

• Expensive — typically $2,500+ as of 2026.
• Less mature — fewer products, less independent test data.
• Sensor maintenance — keeping LiDAR optics clean matters; wet leaves and pollen can degrade accuracy.

Best for

• Properties with frequent moving obstacles (kids, pets, deliveries)
• Heavily-treed properties where RTK signal is unreliable
• Buyers willing to pay a premium for the most flexibility

Decision matrix

Use the calculator

The trade-offs above are the broad strokes. To find the specific mowers that fit your yard:

Run the Lawn-Fit Calculator →

Enter yard size, slope, obstacle complexity, Wi-Fi availability, and budget. The calculator returns ranked mowers with coverage time math + boundary recommendation.

FAQ

Sources:

• Manufacturer spec sheets cited in /data/mowers.json
• Husqvarna — Why Robotic Mowers
• Mammotion — RTK GPS explained