CHCNAV i76 GNSS Receiver

Data Sheet | User Guide
Training Videos

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What’s Included

The CHCNAV i76 Rover Kit – Part Number 8001 010 408 includes:

• 1× A11356980007070507 – CHCNAV i76 GNSS Receiver, Rx/Tx
• 1× 4101 030 011 – SMA Whip Antenna, 410–470 MHz
• 1× 4103 010 096 – USB Type-C Cable
• 1× 4106 040 444 – Rover Transport Hard Case
• 1× 4106 040 153 – Rover Hard Case Inner Carton
• 1× 4106 040 225 – Rover Hard Case Outer Carton
• 1× 0103 051 069 – CHCNAV GNSS Receiver Case Label
• 1× 4102 020 026 – Range Pole
• 1× 4102 070 001 – Auxiliary H.I. Tool, Silver
• 1× 4104 060 069 – 5 V / 2.4 A Power Adapter

CHCNAV’s current i76 user guide identifies the standard rover configuration as including the receiver, 410–470 MHz SMA antenna, power adapter, USB Type-C cable, range pole, auxiliary H.I. tool, and transport hard case.

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Overview

The CHCNAV i76 is a compact Visual IMU-RTK GNSS receiver designed for professional surveying, construction layout, mapping, and engineering applications. Despite weighing only 450 g (0.99 lb), the i76 combines a 1408-channel GNSS engine, fifth-generation Ultra-IMU, dual cameras, CAD AR Visual Stakeout, and an integrated UHF radio in a palm-sized receiver.

The i76 uses CHCNAV's iStar2.0 positioning technology together with a fourth-generation GNSS antenna for dependable multi-constellation satellite tracking. Standard RTK performance is specified at 8 mm + 1 ppm horizontal and 15 mm + 1 ppm vertical, while the 200 Hz AUTO-IMU allows measurements to be collected with the pole tilted as much as 60°.

Two integrated wide-angle cameras add Visual Navigation and CAD AR Visual Stakeout, giving crews intuitive camera-based guidance directly toward layout points. Combined with its lightweight design, long battery life, IP68 protection, and integrated UHF communication, the i76 is designed as a highly portable everyday RTK rover.

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What Does Rx/Tx Mean?

Rx/Tx means Receive / Transmit.

On a GNSS receiver, this refers specifically to the capabilities of the built-in UHF radio:

• Rx – Receive: The receiver can receive RTK correction data transmitted by another GNSS base station.
• Tx – Transmit: The receiver can transmit RTK correction data to another GNSS receiver.

Because this i76 receiver is the Rx/Tx version, it is not limited to functioning as a radio rover. It can also be configured as a UHF RTK base station and transmit corrections to compatible rovers.

This is an important distinction because CHCNAV also manufactures an Rx-only i76, which can receive UHF corrections but cannot transmit them as a radio base. CHCNAV specifically identifies receiver A11356980007070507, included in this kit, as an TX/RX radio model.

In practical terms:

Rx-only i76: Rover use
Rx/Tx i76: Rover or UHF base use

The receiver included here is the more versatile Rx/Tx configuration.

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Key Features

• 1408-channel multi-constellation GNSS
• CHCNAV iStar2.0 positioning technology
• 5th Generation Ultra-IMU
• 200 Hz AUTO-IMU tilt compensation
• Pole tilt measurement up to 60°
• Dual integrated 2 MP cameras
• CAD AR Visual Stakeout
• Visual Navigation through LandStar
• RTK accuracy of 8 mm + 1 ppm horizontal
• Integrated UHF Rx/Tx radio
• 410–470 MHz UHF operation
• Can operate as a UHF rover or UHF base
• Up to 17 hours RTK rover runtime
• Lightweight 450 g (0.99 lb) design
• IP68 dust and water protection
• IK08 impact protection
• Designed to survive a 2-meter pole drop
• 8 GB high-speed internal memory
• Bluetooth 5.4, Wi-Fi, and NFC

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Palm-Sized, 450 g Design

One of the most notable characteristics of the i76 is its compact size.

The receiver measures only approximately 106 mm in diameter × 55.6 mm high and weighs just 450 g (0.99 lb). CHCNAV describes the design as approximately 40% lighter and 50% smaller than typical industry receivers.

This reduced weight is particularly useful for rover crews who carry a GNSS pole throughout the workday. The compact receiver puts less weight at the top of the pole while still integrating GNSS, IMU, cameras, UHF radio, wireless communications, and internal battery power.

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1408-Channel GNSS with iStar2.0

The i76 features a 1408-channel GNSS engine with iStar2.0 technology for multi-frequency, multi-constellation satellite tracking.

Supported signals include:

• GPS: L1C/A, L2C, L5
• GLONASS: L1, L2, L3*
• Galileo: E1, E5a, E5b, E6*
• BeiDou: B1I, B2I, B3I, B1C, B2a, B2b*
• QZSS: L1C/A, L1C, L2C, L5
• NavIC/IRNSS: L5
• SBAS: L1, L5*
• PPP: PPP-B2b and E6B-HAS

CHCNAV pairs the GNSS engine with its fourth-generation antenna and iStar2.0 technology to improve RTK reliability in challenging conditions, including areas affected by elevated solar activity.

*Availability of certain signals may depend on firmware and satellite service availability.

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Professional RTK Accuracy

The i76 provides survey-grade centimeter positioning for everyday RTK workflows.

CHCNAV specifies:

• Horizontal RTK: 8 mm + 1 ppm RMS
• Vertical RTK: 15 mm + 1 ppm RMS
• Initialization time: <10 seconds
• Initialization reliability: >99.9%

The receiver also supports PPK, high-precision static, static, rapid-static, code differential, and autonomous positioning workflows.

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5th Generation Ultra-IMU

The i76 incorporates CHCNAV's fifth-generation Ultra-IMU with a 200 Hz update rate for automatic pole-tilt compensation.

Once active, the IMU allows measurements to be taken without holding the survey pole perfectly vertical. This can significantly improve productivity when collecting points near:

• Buildings
• Walls
• Fences
• Vehicles
• Trenches
• Vegetation
• Utility structures
• Other physical obstructions

The system supports pole tilt from 0–60°. CHCNAV specifies additional horizontal pole-tilt uncertainty of typically less than 8 mm + 0.3 mm/° when tilted up to 30°.

The IMU is also designed to operate without dependence on magnetic heading, helping maintain reliable tilt compensation around equipment and structures that could interfere with a conventional electronic compass.

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CAD AR Visual Stakeout

Unlike a conventional GNSS receiver, the i76 incorporates dual wide-angle cameras that work with LandStar to provide visual stakeout guidance.

The cameras feature:

• 2 MP resolution each
• Approximately 95° field of view
• 30 fps imaging
• F2.4 aperture

With CAD AR Visual Stakeout, design information can be displayed over the live camera view, allowing the operator to visually follow the intended path toward the stakeout location.

CHCNAV states that this workflow can improve overall stakeout efficiency by up to 40% compared with conventional navigation methods.

This is particularly useful for construction layout, foundation stakeout, utilities, and projects containing large numbers of design points.

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Visual Navigation with Virtual Pole Tip

The i76 also supports CHCNAV's Visual Navigation workflow through LandStar.

Rather than relying entirely on arrows, bearing values, and distance numbers, the operator receives live visual guidance as they approach the target point.

CHCNAV's VPT – Virtual Pole Tip technology visually represents the pole tip in relation to the stakeout location, helping the operator align the pole with the intended design point.

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Integrated Rx/Tx UHF Radio

This specific i76 receiver, Part Number A11356980007070507, includes an integrated Rx/Tx UHF radio, allowing the receiver to both receive and transmit corrections. CHCNAV's May 2026 user guide specifically identifies this part number as a TX/RX configuration.

The integrated radio operates from:

• 410–470 MHz
• Transmit power: 0.5 W / 1 W
• Link rate: 9,600–19,200 bps

For A11356980007070507, CHCNAV's current user guide lists support for:

• CHC
• Transparent
• TT450
• Satel

This makes the receiver suitable for conventional UHF base-and-rover workflows without requiring a separate radio module.

Important DistLink Note

CHCNAV produces multiple i76 radio configurations. The May 2026 user guide specifically states that A11356980007070507 supports CHC, Transparent, TT450, and Satel, while Part Number 110102009N is the version identified as additionally supporting DistLink.

Because this kit contains A11356980007070507, DistLink should not be assumed to be included with this particular receiver configuration.

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Base and Rover Capability

The Rx/Tx radio makes this i76 more versatile than an Rx-only rover.

As a rover, the i76 can receive UHF correction data from a compatible RTK base.

As a base, the receiver can be mounted on appropriate base-station hardware and transmit UHF corrections to compatible rover receivers.

CHCNAV's user guide includes dedicated setup procedures for both UHF base and rover operation.

This package is supplied as a rover kit. Additional tripod, tribrach, extension, and base mounting accessories are required for a conventional tripod-mounted base configuration.

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Long Battery Life

The i76 uses a built-in 7.2 V / 4900 mAh lithium battery.

CHCNAV specifies operating times of up to:

• 17 hours – UHF RTK Rover without camera
• 10 hours – Visual Stakeout
• 22 hours – Static
• Up to approximately 10 hours – UHF base using conventional protocols

Battery life varies with radio settings, camera usage, temperature, battery condition, and other operating conditions.

The receiver charges through USB Type-C, with a specified full charging time of approximately 4.5 hours.

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Rugged IP68 Field Design

Despite its small size and low weight, the i76 is designed for professional field environments.

Protection includes:

• IP68 dust and water resistance
• IK08 impact protection
• 2-meter pole-drop resistance
• ISO 9022-36-08 vibration compliance
• MIL-STD-810H vibration compliance
• Operating temperature from -40°C to +65°C (-40°F to +149°F)
• Storage temperature from -40°C to +85°C (-40°F to +185°F)
• Waterproof and breathable membrane

CHCNAV also incorporates a sapphire camera lens and protective structural design to improve durability during daily field use.

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Ideal Applications

The CHCNAV i76 is well suited for:

• Construction layout
• Building foundation stakeout
• Boundary surveying
• Topographic surveying
• Site development
• Utility mapping
• Construction site stakeout
• CAD-based layout
• Stockpile surveys
• As-built surveys
• Road and infrastructure work
• Tilt-compensated point collection
• UHF RTK rover operation
• UHF RTK base operation
• Static and PPK surveying

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Technical Specifications

GNSS Channels: 1408 with iStar2.0

RTK Accuracy

• Horizontal: 8 mm + 1 ppm RMS
• Vertical: 15 mm + 1 ppm RMS
• Initialization time: <10 seconds
• Initialization reliability: >99.9%

PPK Accuracy

• Horizontal: 3 mm + 1 ppm RMS
• Vertical: 5 mm + 1 ppm RMS

High-Precision Static

• Horizontal: 2.5 mm + 0.1 ppm RMS
• Vertical: 3.5 mm + 0.4 ppm RMS

Static / Rapid Static

• Horizontal: 2.5 mm + 0.5 ppm RMS
• Vertical: 5 mm + 0.5 ppm RMS

Visual Stakeout

• Horizontal: 8 mm + 1 ppm RMS
• Vertical: 15 mm + 1 ppm RMS

Positioning Rate: 1 Hz, 5 Hz, supported 10 Hz operation

IMU

• 5th Generation Ultra-IMU
• 200 Hz AUTO-IMU
• Tilt range: 0–60°
• Calibration-free
• Resistant to magnetic disturbances

Cameras

• Dual 2 MP cameras
• Approximately 95° field of view
• 30 fps
• F2.4 aperture

Built-In UHF

• Rx/Tx
• Frequency: 410–470 MHz
• Transmit power: 0.5 W / 1 W
• Link rate: 9,600–19,200 bps
• Protocols for A11356980007070507: CHC, Transparent, TT450, Satel

Wireless

• Bluetooth 5.4 BDR & EDR
• Wi-Fi 2.4 GHz 802.11g
• Wi-Fi 5 GHz 802.11ac
• NFC touch pairing

Storage: 8 GB high-speed internal memory

Ports

• 1× USB Type-C
• 1× SMA female UHF antenna port

Battery: Built-in 7.2 V / 4900 mAh lithium-ion

Operating Time

• UHF RTK Rover without camera: Up to 17 hours
• Visual Stakeout: Up to 10 hours
• Static: Up to 22 hours
• UHF RTK Base: Up to 10 hours with supported conventional protocols

Charging: USB Type-C, 5 V / 2 A

Charging Time: Approximately 4.5 hours

Ingress Protection: IP68

Impact Protection: IK08

Drop Rating: 2-meter pole drop

Operating Temperature: -40°C to +65°C (-40°F to +149°F)

Dimensions: Ø106 × 55.6 mm (Ø4.17 × 2.1 in)

Weight: 450 g (0.99 lb)

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Compact Visual GNSS with Full UHF Base/Rover Capability

The CHCNAV i76 Rx/Tx combines professional RTK positioning, fifth-generation Ultra-IMU tilt compensation, dual-camera CAD AR Visual Stakeout, and a two-way UHF radio in an exceptionally compact 450 g receiver. Because this configuration can both receive and transmit UHF corrections, it provides greater flexibility than an Rx-only rover while remaining small and lightweight enough for everyday surveying and construction layout.