The CHCNAV i93 is a flagship GNSS receiver with 1408-channel tracking, visual positioning and IMU tilt compensation for fast, reliable centimetre accuracy. Measure hard-to-reach points without occupying them and work confidently in challenging environments. Supplied and supported in the UK by Tri-Site Survey Equipment.
CHCNAV i93 Visual IMU-RTK GNSS
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Product Features
Engineered for Versatile Field Use
Full connectivity — Wi-Fi, Bluetooth, NFC, plus 4G and UHF modems — supports every RTK survey mode. Smart power management delivers up to 34 hours of network rover operation, and a robust magnesium alloy body is shock-, dust- and water-resistant for uninterrupted operation.
Visual Survey & 3D Modelling
Combining the IMU with a premium global-shutter camera and video photogrammetry, the i93 extracts survey-grade 3D coordinates from real-world video in seconds. Dynamic panoramic capture and auto image matching boost productivity by 60%, with high-speed continuous shooting at 85% overlap ensuring reliable processing.
1892-Channel GNSS with iStar Technology
A 1,892-channel GNSS chip with iStar technology and an RF-SoC processor delivers a 15% boost in survey-grade RTK performance, while a hybrid engine with narrowband interference mitigation improves signal tracking and data quality by over 20% — excelling in the most challenging environments.
PointSky — Surveying Without a Base Station
PointSky delivers real-time centimetre-level accuracy via satellite, with no local base station or NTRIP service needed. It cuts equipment and setup time by 50% and lets one operator complete large-scale topographic, cadastral and stakeout surveys with a single receiver — achieving <2.5cm (CEP95) accuracy with 1–5 minute convergence.
Detailed Specifications
AR Visual Stakeout:
The i93's AR stakeout displays design coordinates as a bold directional arrow overlaid on the camera's live view, with real-time distance shown on screen. Instead of interpreting abstract numbers on a controller screen, the operator simply walks toward the arrow until the distance reads zero. For less experienced staff, this removes the most common source of stakeout error. For experienced surveyors, it cuts stakeout time significantly on high-volume programmes.
Visual Surveying:
The i93's dual cameras extract survey-grade 3D coordinates directly from real-world video - letting you measure points you cannot physically reach with a pole. Areas under bridge decks, roof eaves, overhead power infrastructure, and the edges of dangerous excavations can all be measured accurately from a safe distance. For construction verification and as-built surveys in live environments, this removes the need to close areas or work at height.
3D Building and Facade Modelling:
Merge the i93's dynamic panoramic video with drone imagery to create 3D joint models of buildings and facades within standard 3D modelling software. For digital twin projects, heritage documentation, and detailed as-built records of complex structures, this workflow delivers georeferenced 3D outputs without requiring a separate photogrammetry system. The i93 and a UAV together replace multiple pieces of specialist equipment.
34-Hour Battery:
The i93's 9900 mAh battery delivers up to 34 hours of RTK rover operation - more than twice the endurance of most competing receivers. On a busy construction site or remote topographic survey, this means a single charge comfortably covers a full working day plus contingency, without battery logistics becoming a management issue.
Built-In 4G LTE:
Unlike the i85 which requires a separate device for cellular data, the i93 has integrated 4G LTE - connecting directly to NTRIP correction services over the mobile network without additional hardware. Combined with built-in Wi-Fi, Bluetooth, NFC, and UHF modem, the i93 supports every RTK connectivity mode a professional survey programme might require, from CORS networks to local base-rover setups.
PointSky Satellite Correction Included:
One year of PointSky is included as standard with the i93. Delivered via satellite rather than a mobile network, PointSky provides 2.5 cm accuracy in open-sky conditions without a base station or NTRIP connection - ideal for remote area surveys, large sites where a base is impractical, and any location where mobile data coverage is unreliable. PointSky and the i93's integrated 4G together give the operator a correction service for essentially any environment.
GNSS Accuracies (RMS)
- RTK: H: 8mm + 1ppm / V: 15mm + 1ppm; initialisation <10s, reliability >99.9%
- PPK: H: 3mm + 1ppm / V: 5mm + 1ppm
- PointSky: H: 2.5cm (CEP95) / V: 5cm; convergence standard <5min, specific regions <1min; re-convergence <1min; uptime during interruption up to 300s
- PPP: PPP-B2b, E6B-HAS; H: 10cm / V: 20cm
- High-Precision Static: H: 2.5mm + 0.1ppm / V: 3.5mm + 0.4ppm
- Static & Rapid Static: H: 2.5mm + 0.5ppm / V: 5mm + 0.5ppm
- Code Differential: H: 0.4m / V: 0.8m
- Autonomous: H: 1.5m / V: 2.5m
- Visual Survey: Typically 2–4cm, range 2–15m
- Visual Stakeout: H: 8mm + 1ppm / V: 15mm + 1ppm
- Positioning Rate: 1Hz, 5Hz, 10Hz
- Time to First Fix: Cold start <45s; Hot start <10s; re-acquisition <1s
IMU & Tilt
- IMU Update Rate: 200Hz, AUTO-IMU
- Tilt Angle: 0–60°
- RTK Tilt-Compensated: Additional horizontal uncertainty typically <8mm + 0.7mm/° tilt down to 30°
- Tilt Sensor: Calibration-free IMU, immune to magnetic disturbance, E-Bubble levelling
Cameras
- Sensor: Global shutter, 2MP & 5MP
- Field of View: 75°
- Video Frame Rate: 25fps
- Image Group Capture: Video photogrammetry; typically 2Hz, up to 25Hz; max capture 60s (~60MB per group)
- Illumination: Starlight-grade, OmniPixel-GS; full colour to 0.01 lux
Hardware
- Size: Ø152mm × 81mm
- Weight: 1.15kg (2.54 lb)
- Front Panel: 1.1" OLED colour display, 2 LEDs, 2 physical buttons
- Data Storage: 32GB internal, supports 128GB external expansion
Communication
- Wireless Pairing: NFC touch pairing
- Wi-Fi: 802.11 a/b/g/n/ac, access point mode
- Bluetooth: 5.0 and 4.2 + EDR, backward compatible
- Network Modem: Integrated 4G — TDD-LTE, FDD-LTE, WCDMA, EDGE, GPRS, GSM (Nano-SIM)
- Built-in UHF Radio: 410–470MHz, 0.5W–2W; protocols CHC/Transparent/TT450/Satel; range typical 3–5km (up to 15km optimal)
- Ports: 1× 7-pin LEMO (RS-232); 1× USB Type-C; 1× UHF antenna (TNC female)
- Data Formats: RTCM 2.x, RTCM 3.x, CMR I/O; HCN, RINEX 2.11/3.02; NMEA 0183; NTRIP Client/Caster
Electrical
- Battery: Built-in non-removable 9,900mAh, 7.2V Li-ion
- Power Consumption: UHF/4G RTK rover (no camera) typ. 2.8W; Visual Stakeout/Survey typ. 4W
- Operating Time: UHF/4G RTK rover (no camera) up to 34h; Visual Stakeout/Survey up to 24h; UHF RTK Base up to 16h; Static up to 36h
- External Power Input: 9V DC to 28V DC
Environment
- Operating Temperature: -40°C to +65°C
- Storage Temperature: -40°C to +85°C
- Humidity: 100% non-condensing
- Ingress Protection: IP68 (IEC 60529)
- Drop: Survives 2m pole-drop
- Vibration: MIL-STD-810H
Software
- LandStar: Visual Surveying, Visual Stakeout, 3D Modelling, CAD AR Visual Stakeout
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Use Cases
Boundary Survey
Utility Mapping
3D Building and Facade Modelling
Topographic Survey
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