Navimow X4 series review: an open acre with steep slopes
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If you've got an open acre with steep banks, the X430 is the one in this series we'd look at. It's rated 1 acre (43,560 sq ft) and 84% (40°).
If your side passage is under about 2 ft, if the lawn has no Wi-Fi or cell service, or if you don't want a yearly fee after the free period, we'd skip it.
Paid links: see disclosure
See Navimow X430 on Amazon
Key numbers for your yard
Key numbers for your yard
- Rated area
- 1 acre (43,560 sq ft)Comfortable for about 0.8 acres with trees or two zones. how we size
- Max slope
- 84% (40°), a rise of 8.4 ft over 10 ft
- Passage
- Body width 24 inIf your side passage is narrower than the body, it won't get through.
- Navigation
- Network RTK, Vision, Time-of-flight sensorNetwork RTK needs Wi-Fi or 4G at your lawn. An antenna is included, and Segway calls it optional.
- After the free period
- A yearly fee for Connect+The good news: on the X4, Connect+ is free for your first year on the X430. After that there's a yearly fee, and Segway doesn't say how much, which we'd like to know too. Network RTK is free for life, as long as Segway keeps its cloud running.
Variants
Paid links: see disclosure
Swipe sideways to see every column.
| Model | Rated area | Max slope | What differs | Status | Amazon |
|---|---|---|---|---|---|
| Navimow X430 | 1 acre (43,560 sq ft) | 84% (40°) | The one we'd start with. Antenna included but optional. Home Depot listing: 120 zones, and one year of free 4G. | On sale in the US as of Oct 10, 2026. | See on Amazon |
| Navimow X450 | 1.5 acres (65,340 sq ft). Map max 1.8 acres | 84% (40°) | Rated 1.5 acres (65,340 sq ft). We'd use the X4 page's map maximum of 1.8 acres for the X450 only. Same 84% (40°) slope. Connect+ is free for 2 years, then a yearly fee. Other specs aren't published. | On sale in the US as of Oct 10, 2026. | There's no Amazon link for this model yet because we couldn't confirm a current amazon.com listing for this exact version. |
Specs we checked
Swipe sideways to read every column.
| Figure | Published value | Source |
|---|---|---|
| Rated area | 1 acre (43,560 sq ft) | Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026. |
| Max slope | 84% (40°) | Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026. |
| Navigation | Network RTK plus 360° VSLAM vision and a time-of-flight depth sensor; base station antenna included but optional | Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026. |
| Cutting width | 17 in | Navimow X4 series, Segway Navimow US store; amazon.com listing, checked Oct 10, 2026. |
| Cutting height | 0.75–4 inA retailer copy gives 0.8–4 in. We'd use 0.75–4 in from the amazon.com listing. | amazon.com listing, checked Oct 10, 2026. |
| Body width | 24 in | Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026. |
| Obstacle clearance | 2.8 inThe Navimow X4 page also says up to 5.9 in on gentle slopes. | Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026. |
| Battery | 21.6 V, 13 Ah; 110 min runtime | Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026. |
| Zones | 120 zones | Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026. |
Slope and size
The slope we'd plan on is 84%, a rise of 8.4 ft over 10 ft. The rated area is 1 acre. Comfortable for about 0.8 acres with trees or two zones. how we size
Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026.
Makers usually publish one maximum slope and don't say whether it applies in the middle of your lawn or at the edge. When a model also gives a lower figure for the edge, that's the one to use there. If your bank runs into a bed or a fence, we'd leave some margin, because edges are usually harder.
The X450 is the larger sibling, rated 1.5 acres (65,340 sq ft), with a map maximum of 1.8 acres stated for that model. We couldn't confirm a current amazon.com listing for the X450, so there's no button for it.
Trees and network RTK
If your acre is open, the X430's network RTK is what we'd count on. Vision and a time-of-flight sensor are also on the spec. Network RTK needs Wi-Fi or 4G at the lawn. If canopy covers the path, that can still drop the fix, which is why a wooded acre is a reason to read the LUBA 3 AWD review before this one. The antenna ships in the box and the listing calls it optional.
Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026.
A 24 in body, and the zone count
The body is 24 in wide, so it won't fit through your gate or side passage if yours is narrower than that. The Home Depot listing gives 120 zones and a battery of 21.6 V, 13 Ah; 110 min runtime. The cut is 17 in wide.
Navimow X4 series, Segway Navimow US store; Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026.
Grass height
Cutting height is 0.75–4 in on the amazon.com listing, and that's the range we'd use. A retailer copy gives 0.8–4 in, so those two don't match. The listing range covers both a short Bermuda cut and a tall St. Augustine cut.
amazon.com listing, checked Oct 10, 2026.
Edges
Segway doesn't publish a distance-from-the-edge figure. Owner threads still describe trimming and missed strips, so we'd keep a string trimmer for the beds. Obstacle clearance is 2.8 in, and the X4 page says up to 5.9 in on gentle slopes.
Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026.
What owners report
In the 4 owner threads we read in October 2026:
- Owners say it keeps up St. Augustine and Bermuda when you run it often. Navimow thread on warm-season grass · Second thread on the same grasses
- Owners still trim the edges, and some describe missed strips. Thread on edges and missed strips
- If the mower is lifted and powers off, Locate My Mower stops. Thread on Locate My Mower after a lift
Honest limits
- If your side passage is narrower than about 2 ft, the 24 in body won't get through.
- If your lawn has no reliable Wi-Fi or cell coverage, network RTK doesn't have a signal.
- If you don't want a yearly connectivity fee after the free period, we'd look elsewhere.
- If heavy canopy covers the mowing path, network RTK doesn't replace a map the mower can see.
Connectivity and support
Connect+ on the Navimow X4 is free for 1 year on the X430, or 2 years on the X450, and then there's a yearly fee. Network RTK is free for life, as long as Segway keeps its cloud running. The Home Depot X430 listing says one year of free 4G and free lifetime network RTK. Those two pages don't use the same words, and neither one says what the fee costs.
Navimow X4 series, Segway Navimow US store; Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026.
Support outlook
Segway has no FCC Conditional Approval for new models, but models already authorized can keep receiving updates until at least Jan 1, 2029. A secondary article says Segway's US models are already authorized. We couldn't find that on a Segway page, so we wouldn't count on it.
Segway's own site was sold out on Oct 10, 2026. The amazon.com listing was live, so that's where we'd look.
Two other yards
If trees cover your lawn, the LUBA 3 AWD 3000 is the comparison. It's rated 0.75 acres, not a full acre, and it adds LiDAR. LUBA 3 AWD review.
If your banks go up to 30%, the Worx Landroid Vision Cloud WR340 is the open-acre comparison. Worx Landroid Vision Cloud review.
Questions
Will the X430 mow an acre under trees?
Do I have to install the antenna?
What happens after the free year?
See these models
The X430 button is up top. The two comparisons:
Sources
Navimow X4 series, Segway Navimow US store, checked Oct 10, 2026.
Home Depot X430 listing (manufacturer copy), checked Oct 10, 2026.
amazon.com listing, checked Oct 10, 2026.