CHCNAV i76 Palm-Sized Visual IMU-RTK GNSS

Vendor: CHCNAV Type: GNSS Receivers

The CHCNAV i76 is a palm-sized GNSS receiver combining visual positioning with IMU tilt compensation, delivering centimetre accuracy in a compact, lightweight body. Ideal for surveyors who want capable RTK performance that fits in a pocket. Supplied and supported in the UK by Tri-Site Survey Equipment.

£7,205.00

Options: With HCE620 Data Controller

With HCE620 Data Controller With LT800 Data Controller Without A Data Controller

Payment & Security

Your payment is secure. We don’t store or see your card details.

View Full Details

Request a Demo | Hire This | Enquire About This Product →

Product Features

Palm-Sized with GNSS, IMU & Dual Cameras

At just 450g and half the size of standard models, the i76 unifies GNSS, Auto-IMU and dual cameras in one rugged, sapphire-lensed body with IP68 protection, 2m drop resistance and over 17 hours of operation.

4th Gen Air-Medium Antenna & Hybrid GNSS Engine

1,408 channels with comprehensive constellation tracking, iStar 2.0 and ionospheric suppression secure an RTK fix rate over 96% in solar-active regions. Paired with CHCNAV iBase, UHF coverage extends up to 25km in standard conditions (5–8km in dense foliage or suburban landscapes).

5th Gen Ultra-IMU Technology

An interference-free Ultra-IMU running at 200Hz, enhanced by EKF algorithms, delivers automatic pole-tilt compensation accurate to 3cm at up to 60° tilt. "Poke-and-measure" eliminates manual initialisation and bubble centring, boosting accuracy by 30%.

Efficient CAD + AR Stakeout

Integrating CAD base maps with augmented-reality visualisation, the i76 boosts construction stakeout efficiency by up to 40%. GNSS, IMU, AR and MR combine for an intuitive view of site layouts — anticipating pipeline directions, simplifying foundations, and streamlining redline reviews and centreline verification for road construction.

Detailed Specifications

Beyond Visual, Within Palm

The i76 Palm Visual RTK is a compact, lightweight surveying tool engineered for precision and ease in challenging conditions. Weighing just 450g — 40% lighter and 50% smaller than industry standards — it packs integrated GNSS, IMU and 95° wide-angle dual cameras into a rugged, biomimetic body with IP68 protection and 2m drop resistance. One-button operation and a synchronised LED keep fieldwork simple and fast.

RTK Reliability in Tough Conditions

A 4th Gen air-medium GNSS antenna and hybrid GNSS engine stabilise tracking across all constellations and frequencies, achieving an RTK fix rate of over 96% even in solar-active regions. With 1,408 channels, iStar 2.0 technology and ionospheric interference suppression, the i76 stays accurate where high ionospheric activity would trouble lesser receivers.

Tilt Without the Hassle

5th Gen Ultra-IMU technology improves accuracy by 30%, maintaining 3cm accuracy even at 60° pole tilt. "Poke-and-measure" operation removes any need for manual IMU initialisation or bubble centring — the IMU stays operational whether the pole is handheld, shoulder-mounted or horizontal.

Built to Last, All Day

A durable biomimetic structure with sapphire camera lenses resists impacts and scratches, while intelligent cloud-based OTA upgrades keep the unit current. An energy-efficient lithium battery delivers over 17 hours of continuous operation, making the i76 ideal for professionals who value precision, adaptability and endurance.

GNSS Accuracies (RMS)

RTK: H: 8mm + 1ppm / V: 15mm + 1ppm; initialisation <10s, reliability >99.9%
PPK: H: 3mm + 1ppm / V: 5mm + 1ppm
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 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

Cameras

Sensor: Dual cameras, 2MP each
Field of View: 95° ± 3°
Aperture: F2.4
Video Frame Rate: 30fps
Lenses: Sapphire (scratch/impact resistant)

Hardware

Size: Ø106mm × 55.6mm
Weight: 450g (0.99 lb)
Front Panel: 2 synchronised LEDs, 1 button
Data Storage: 8GB high-speed memory

Communication

Wireless Pairing: NFC touch pairing
Wi-Fi: 2.4G 802.11g; 5G 802.11ac (CH42 & 155)
Bluetooth: V5.4 BDR & EDR
UHF Radio: 410–470MHz, 0.5W/1W; protocols CHC/Transparent/TT450/Satel; range typical 3km (up to 5km optimal)
Ports: 1× USB Type-C (power, data, OTG firmware update); 1× UHF antenna (SMA 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 7.2V / 4900mAh high-density lithium
Charging: Type-C 5V / 2A; full charge in 4.5 hours
Operating Time: UHF/4G RTK rover (no camera) up to 17h; Visual Stakeout up to 10h; Static up to 22h

Environment

Operating Temperature: -40°C to +65°C
Storage Temperature: -40°C to +85°C
Humidity: 100% non-condensing
Ingress Protection: IP68 (IEC 60529)
Impact Protection: IK08 (IEC 62262:2002)
Drop: Survives 2m pole-drop
Vibration: ISO 9022-36-08 and MIL-STD-810H

Software

LandStar: Visual Navigation, CAD AR Visual Stakeout

Keep up to date with Tri-Site News

CHCNAV i93 Datasheet PDF ↓

CHCNAV i76 Palm-Sized Visual IMU-RTK GNSS