Technology-shift
RTK vs. EPOS satellite positioning in wire-free mowers
Wire-free robot mowers have split into two distinct positioning architectures: single-band RTK systems relying on a fixed base station, and multi-constellation EPOS satellite platforms that triangulate position without ground hardware.
The technological divide
Two architectures, two failure modes
The category has split into two architectural approaches. Each works well in some conditions and breaks down in others.
RTK (Real-Time Kinematic) with fixed base station
A ground base station corrects the robot’s satellite position to within a few centimeters — but on a single frequency, so a blocked signal can drop the lock.
A fixed antenna installed on the property broadcasts RTK correction signals to the mower, achieving centimeter-level accuracy within line-of-sight. Accuracy depends on base-station placement and satellite constellation availability; canopy and multipath signals degrade performance.
- Centimeter accuracy in open sky conditions
- Degrades under dense canopy or signal obstruction
- Base station is property-bound, non-portable
- No subscription required for satellite corrections
EPOS (multi-constellation satellite, no base station)
The robot listens to several satellite frequencies at once, so it holds an accurate position even when trees or buildings block some signals.
EPOS fuses signals from multiple satellite constellations (GPS, GLONASS, Galileo, BeiDou) without a ground base station. Virtual boundaries are defined via app. Positioning accuracy is documented at plus or minus 2 cm in open conditions; performance decreases under dense overhead cover.
- No base-station hardware to install or maintain
- Portable across properties after re-mapping
- Accuracy narrows under heavy canopy (plus or minus 2-10 cm)
- Higher unit cost versus RTK base-station alternatives
Where each robot sits
Does the architecture pay off?
Horizontal: where each robot sits between the two architectures. Vertical: its documented result on the headline test.
Mammotion LUBA 2 AWD2-5 min drift, recovers
Segway Navimow X330Pauses, re-acquires
450X NERAAccuracy widens, continuesVertical axis — documented result on: Positioning under moderate tree canopy
What each architecture can and can’t do
Capability tests
Each capability is documented from owner reports, manufacturer specifications, or third-party reviews. No in-person testing.
Mammotion LUBA 2 AWDSegway Navimow X330450X NERAWhat the architecture difference means
Different homes, different sensor stacks
Where each architecture fits, by condition.
Established property with dense canopy
Properties where 40% or more of the lawn sits under overhead tree cover create signal dropout events in both architectures. RTK base-station systems (LUBA 2, Navimow X330) enter 2-5 minute holding patterns; owner reports document 2-4 dropouts per mowing session in heavy canopy. EPOS continues at reduced accuracy (plus or minus 2-10 cm) rather than pausing, covering more area at the cost of tighter edge precision.
Open suburban lot, single permanent property
Properties under 8,000 square meters with clear sky visibility and no planned relocation extract maximum value from RTK base-station systems: centimeter-level boundary precision reduces edge touch-up frequency to 1-2 times per season per manufacturer documentation. EPOS accuracy in these conditions is comparable, but unit cost runs $1,500-3,900 higher than RTK-class mowers.
Multi-property use or future relocation plans
RTK base-station calibration is property-specific and costs $800-1,200 to remove and reinstall per manufacturer documentation. For owners managing multiple sites or anticipating relocation within 3-5 years, EPOS platforms re-map via app with no ground hardware transfer cost. The portability difference is not a preference; it is a documented infrastructure commitment.
Common questions