Navimow X450
Rated for 1.5 acres and 84% grade — that is 40°, not 84°. On a real lawn, once you allow for borders and travel paths, plan on about 1.2 acres.
What it handles
All four wheels drive, which is what buys the steeper rating. That puts it in the small group that can work genuinely steep ground.
Navigation is satellite-based without vision or LiDAR, so heavy tree cover is a real risk — it loses its fix under canopy.
If your ground is steeper
These are rated for a similar area but hold more grade than the Navimow X450’s 84%.
Cross-shopped with
Rated for a similar area, at the same grade or less.
How confident we are
Cross-checked against the manufacturer and at least one other source.
Slope corrected from 50% to 84%: 50% is the X3 series rating (X330/X350/X390), merged into this row by mistake. X4 series has no separate traction-control slope figure, so 84% is the only applicable number. US rated area 1.5 acres; the EU X450 is 5000 sq m (1.24 ac) - genuinely different, do not equate.