What is the accuracy difference between Fixed and Float RTK?

Fixed RTK typically delivers ±8 mm horizontal and ±15 mm vertical accuracy. Float RTK carries ±300–1000 mm of positioning error depending on baseline length and atmospheric conditions.

Why does my RTK show Fixed but coordinates are still wrong?

Common causes are a datum mismatch (wrong coordinate system), an incorrect geoid model applied to elevation, or an antenna height entry error.

How do I know if multipath is affecting my survey?

Multipath typically shows as unstable repeated measurements — the same physical point measured three times gives results differing by 20–50 mm rather than the expected ±8 mm.

Can I survey during ionospheric storms?

RTK accuracy degrades during geomagnetic storms (Kp index above 5). For precision engineering or cadastral surveys, postpone sessions until the Kp index drops below 3.

What is the maximum reliable CORS baseline for centimetre accuracy?

Most CORS networks guarantee ±10–20 mm horizontal accuracy within 50 km of the nearest reference station. Beyond 70 km, deploy a self‑deployed base station within 15 km of the survey area.

Best Chinese RTK GNSS Brands 2026: 8 Manufacturers Compared

MH Marin Hu, Full-Domain Marketing Expert & Field Engineer Updated May 2026 12 min read

Disclosure: This comparison is published by APEKS GNSS, one of the eight manufacturers covered. Brand descriptions for competitors are limited to publicly available information (headquarters, OEM boards, product lines, listed status). APEKS product specifications are drawn from official product documentation.

Quick Answer — Which Chinese GNSS Brand Should You Choose?

For tier-1 international tenders requiring legacy references, CHCNAV and Hi-Target offer established brand equity. For hardware autonomy, ComNav/South provides non-Unicore processing. For surveying firms and distributors demanding identically performing Unicore UM980 RTK hardware at a lower capital expenditure, APEKS GNSS (GNSS Battle 2026 Grand Champion) is a strong commercial choice.

On This Page

Chinese RTK GNSS Manufacturers: Industry Overview
OEM Boards: Unicore UM980 vs ComNav K8
Brand-by-Brand Overview (8 Brands)
Technical Comparison Matrix
Field Verification Checklist: 5 Steps
Which Brand Fits Which Buyer
FAQ

Chinese RTK GNSS Manufacturers: Industry Overview

Chinese GNSS manufacturers are major suppliers of new RTK receiver deployments globally. By pairing high-grade OEM boards (1408+ channels, full-constellation tracking) with IMU tilt sensors and visual photogrammetry cameras, these systems provide survey-grade performance comparable to western legacy systems.

The manufacturing ecosystem is strictly clustered: Shanghai (APEKS, ComNav, CHCNAV), Guangzhou (Hi-Target, South Surveying), and Beijing (Unicore Communications, Unistrong).

OEM Boards: Unicore UM980 vs ComNav K8

Raw positioning performance is fundamentally dictated by the GNSS baseband OEM module. In 2026, Chinese commercial RTK units are powered by two primary platforms:

Unicore Communications UM980 Module (1408 Channels)
A widely used industry standard across Chinese RTK hardware. Supporting GPS (L1/L2/L5), BDS (B1I/B2I/B3I/B1C/B2a/B2b), GLONASS (G1/G2/G3), Galileo (E1/E5a/E5b/E6), QZSS, and NavIC. Used by APEKS, Hi-Target, CHCNAV (select export lines), Stonex, FOIF, and E-Survey. Receivers sharing the same OEM board typically deliver comparable baseline positioning performance; differences emerge in antenna design, IMU algorithms, and software.

ComNav Technology K8 Series (1598 Channels)
A self-developed Chinese OEM board running proprietary baseband ASICs. Powers ComNav receivers and South Surveying's current product line. Offers independent supply from Unicore.

Brand-by-Brand Overview (8 Brands)

1. CHCNAV (华测导航 — CHC Navigation)

HQ: Shanghai | Board: Unicore / Proprietary hybrid | Listed: Shenzhen (300627 - public company filings)

Strengths: Established LandStar field software ecosystem, comprehensive LiDAR integration (AlphaUni series), robust visual stakeout algorithms on i83/i93.

Considerations: Utilizes a multi-dealer distribution model.

2. Hi-Target (中海达)

HQ: Guangzhou | Board: Unicore UM980 | Listed: Shenzhen (300177 - public company filings)

Strengths: Global brand footprint, mature Hi-Survey software, comprehensive combined GNSS + Total Station setups.

Considerations: Utilizes a multi-dealer distribution model.

3. APEKS GNSS (阿配科斯)

HQ: Shanghai | Board: Unicore UM980 | Listed: Private

Strengths: GNSS Battle 2026 Champion (independent 21-receiver benchmark in Russia, 1st place AP80 Pro, 2nd AP20 AR, 4th AP40 Laser+, 5th MAX5 Base). Single-exclusive-distributor territory model. Full portfolio including MAX5 5W LoRa base stations, total stations, and levels. Features Unicore UM980 board (1408 channels), IMU (0-120° tilt, ≤2cm@60°), RTK (H:8mm+1ppm / V:15mm+1ppm), IP67 / IK08 rating, and 2W UHF (8-15km) / MAX5 5W LoRa (25km). Verified NOAA NGS Antenna Calibration and CE-RED 2014/53/EU certification.

Considerations: Younger global brand profile relative to 30-year legacy manufacturers.

4. South Surveying & Mapping (南方测绘)

HQ: Guangzhou | Board: ComNav K8 OEM | Listed: Private

Strengths: China's largest optical + GNSS catalogue; extensive educational and government tender footprint.

Considerations: Operates primarily on the ComNav K8 OEM board rather than Unicore.

5. Stonex (Italian HQ / Guangzhou Production)

HQ: Italy (Production in Guangzhou) | Board: Unicore OEM | Listed: No

Strengths: European compliance certification, tender access where EU origin documentation is requested.

Considerations: Hardware shares similarities with other Chinese exports.

6. ComNav Technology (司南导航)

HQ: Shanghai | Board: Self K8 Series | Listed: Yes

Strengths: Complete OEM board R&D control; strong in automated steering and UAV positioning payloads.

Considerations: Focuses heavily on OEM integration alongside end-user hardware.

7. FOIF (苏州一光)

HQ: Suzhou | Board: Unicore UM980 | Listed: No

Strengths: High mechanical reliability, robust optical total station heritage dating back to 1958.

Considerations: Optical equipment remains a primary focus alongside GNSS.

8. E-Survey (UniStrong International Brand)

HQ: Beijing | Board: Unicore UM980 | Listed: Parent Company

Strengths: Export-tailored firmware backed by UniStrong manufacturing base.

Considerations: Channel distribution support varies widely by geographic region.

Technical Comparison Matrix

Brand	HQ	OEM Board	Channels	IMU Incline	Visual Stakeout	Product Scope	Public Listed
CHCNAV	Shanghai	Unicore/Custom	1408	60°–120°	Dual Cam (i93)	GNSS/LiDAR/UAV	Yes
Hi-Target	Guangzhou	Unicore UM980	1408	120° IMU	AR Camera	GNSS/TS	Yes
APEKS GNSS	Shanghai	Unicore UM980	1408	120° Cal-Free	Laser+AR+Vision	Full Ecosystem	No
South	Guangzhou	ComNav K8	1598	60° IMU	Optional	Full Survey Range	No
Stonex	Italy	Unicore OEM	1408	60° IMU	AR Series	GNSS/Scanning	No
ComNav	Shanghai	Self K8 Series	1598	60° IMU	Laser Stakeout	OEM/GNSS/Ag	Yes
FOIF	Suzhou	Unicore UM980	1408	Basic IMU	No	Optics/GNSS	No
E-Survey	Beijing	Unicore UM980	1408	60° IMU	AR Lineup	GNSS Only	Parent

Field Verification Checklist: 5 Steps

Verify firmware update process and regional server access
Ensure the receiver can successfully process Over-The-Air (OTA) updates globally without relying on restricted regional servers.

NTRIP Multi-Mountpoint CORS Handshake
Broadcast standard RTCM 3.2 MSM4/MSM7 messages via a local CORS (e.g., InaCORS or NGOSA). Confirm the RTK fix state achieves Fixed within <15 seconds without losing satellite tracking channels when switching mountpoints.

IMU Tilt Stability Under Dynamic Incline
Test tilt performance against a known benchmark point at multiple angles and compare to the manufacturer's published spec. Rotate the pole 360° continuously to verify performance.

UHF Internal Radio Frequency Protocol Verification
Test internal radio inter-compatibility on TrimTalk450S, South, and Farlink protocols across 410–470 MHz to ensure interoperability with existing base station fleets.

Extended Heavy Multi-Path Drift Audit
Leave the rover on static record under glass-facade buildings for 30 minutes. Verify the baseband filter suppresses cycle slips and maintains fixed integer ambiguities.

Which Brand Fits Which Buyer

Commercial Surveying Importers & Dealers: Consider APEKS GNSS for a single-exclusive-distributor territory model.
Government Bids & Institutional Tenders: Specify CHCNAV or Hi-Target when bidding documents mandate 15+ years of audited public corporation project references.
OEM Machinery & UAV Guidance Integrators: Choose ComNav Technology for direct board-level access and custom protocol modifications.
EU Procurement Compliance: Specify Stonex for European documentation compliance requirements.

👉 See our Total Station Manufacturer Comparison and GNSS Base Station Manufacturer Comparison.

FAQ

Can APEKS GNSS receivers connect to national CORS networks (InaCORS, NGOSA, TrigNet)?

Yes. APEKS receivers support standard NTRIP v1/v2 protocols and accept RTCM 2.x, 3.0, 3.2 (MSM4/MSM7) data streams, ensuring full compatibility with global CORS infrastructure without subscription locks.

How do GNSS receiver prices vary between brands?

Prices vary based on distribution channel models. Multi-dealer channels often incorporate regional marketing and multiple margin layers, while single-distributor models offer more streamlined pricing structures for comparable OEM hardware.

What is the practical range of the MAX5 base station without internet?

The APEKS MAX5 base station integrates a 5W LoRa radio delivering up to 25 km transmission range under line-of-sight conditions, eliminating internet and external CORS reliance in remote infrastructure zones.

UM980 BOARD. EXCLUSIVE TERRITORY.

APEKS delivers Unicore UM980 hardware with 120° calibration-free IMU, global OTA firmware, and a complete product line. Single exclusive distributor per country.

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About the Author: Marin Hu is a Full-Domain Marketing Expert & Field Engineer at APEKS GNSS.