Product Information

Ultra-Compact RTK Rover with Revolutionary 90° Tilt Technology

Name: Alpha 4i GNSS Rover Set – Ultra-Compact RTK with 90° Tilt Sensor
Brand: Alpha Surveying
SKU: MET-GPSR-03
Price: 2900.00 USD
Availability: InStock

The Alpha 4i GNSS Rover Set transforms field surveying with its innovative tilt sensor technology and ultra-portable design. Purpose-built for mobile surveyors who demand precision without compromise.

Revolutionary Tilt Measurement

The integrated IMU tilt sensor enables measurements at any angle up to 90°, eliminating the time-consuming process of leveling your rover pole. This breakthrough technology increases productivity by up to 40% while maintaining centimeter-level accuracy, allowing you to measure points that were previously inaccessible or difficult to reach.

Multi-Constellation Precision

The powerful 1408-channel GNSS receiver tracks all major satellite constellations simultaneously, delivering consistent RTK positioning even in challenging environments. Combined with dual communication options—internal UHF radio for 3km range or external radio compatibility extending to 15km—you maintain reliable connectivity across any project site.

Built for Demanding Fieldwork

All-day operation: 18-hour battery life eliminates mid-day charging breaks
Weatherproof durability: IP67 rating withstands dust, rain, and harsh conditions
Nano-material construction: Lightweight yet rugged aluminum alloy housing
Android integration: DiMap software provides seamless mobile device compatibility
Real-time visualization: Live mapping and stakeout capabilities in the field

Specs

Channels: 1408-channel GNSS module supporting all GNSS satellites and frequencies

IMU Technology: Tilt measurement up to 90°

Positioning Accuracy:

RTK: 8 mm + 1 ppm (horizontal), 15 mm + 1 ppm (vertical)
Static: 2.5 mm + 0.5 ppm (horizontal), 5 mm + 0.5 ppm (vertical)
IMU Tilt Compensation: ± (8 + 0.3 x Tilt) mm

Data Output: NMEA format via 5-pin serial port

Signal Tracking: GPS, GLONASS, BeiDou, Galileo, QZSS, SBAS, NAVIC

Connectivity:

Dual-mode Bluetooth 5.2
USB Type-C port for charging and data transfer
Internal UHF Radio (1W Rx/Tx, 3km range)
External radio support (up to 15km range)

Battery: 18-hour battery life (Ntrip), 15 hours (Radio Receiving), 8 hours (Radio Transmitting)

Dimensions: 98mm x 53mm

Weight: 380g

Durability:

IP67-rated dustproof and waterproof
1.6m drop resistance

Software Compatibility:

DiMap Android-based surveying software
Compatible with Android devices

Features :

Ultra-Compact 90° Tilt Sensor

Survey points without leveling the pole - revolutionary tilt compensation up to 90 degrees

Multi-Constellation GNSS Tracking

GPS, GLONASS, Galileo, and BeiDou support for maximum satellite availability

Lightning-Fast RTK Initialization

Achieve centimeter-level accuracy within seconds of startup

All-Day Battery Performance

12+ hours continuous operation with intelligent power management

Triple Connectivity Suite

Built-in Wi-Fi, Bluetooth, and 4G LTE for seamless real-time communication

Rugged IP67 Construction

Dustproof and waterproof design built for extreme field conditions

Professional Survey Software

Comprehensive field software with advanced stakeout and mapping tools

Lightweight Rover Design

Ultra-portable form factor reduces operator fatigue during long survey sessions

Download Center

Reviews :

4.8/5

★★★★★

Based on verified reviews

★★★★★

Marcus Rodriguez

Licensed Land Surveyor · Verified Purchase

Exceptional RTK Performance with Robust Design

The Alpha 4i delivers consistently accurate centimeter-level positioning across all our cadastral surveys. The 90-degree tilt compensation is a game-changer for efficiency in challenging terrain. Build quality exceeds expectations with reliable IP67 weatherproofing throughout our Pacific Northwest projects.

★★★★★

Jennifer Chen

Senior Survey Technician · Verified Purchase

Ultra-Compact Design Meets Professional Standards

Impressed by the compact form factor without compromising on multi-constellation tracking capability. Real-time connectivity integration seamlessly interfaces with our existing data collection workflows. The tilt sensor accuracy has significantly reduced setup time on boundary surveys.

★★★★★

David Thompson

Construction Survey Manager · Verified Purchase

Reliable Performance in Demanding Construction Environment

Six months of heavy construction site usage demonstrates the Alpha 4i's durability and consistent precision. Multi-constellation support provides excellent satellite availability in urban canyon environments. Professional-grade reliability that meets our stringent project tolerances.

★★★★☆

Sarah Mitchell

Principal Surveyor · Verified Purchase

Solid RTK Solution with Minor Learning Curve

The Alpha 4i provides excellent positioning accuracy and the tilt compensation works flawlessly once properly calibrated. Initial setup required some familiarization with the interface, but overall performance meets professional surveying requirements. Would recommend for firms requiring reliable RTK capability.

★★★★★

Robert Kim

Survey Operations Director · Verified Purchase

Outstanding Value for Professional RTK Applications

Alpha 4i delivers enterprise-grade RTK performance at competitive pricing compared to traditional alternatives. Fast initialization times and stable corrections maintain productivity across diverse survey applications. Alpha Surveying's technical support has been responsive and knowledgeable throughout our implementation.

What's in the Box

Everything you need to get started.

✓ 1× Alpha 4i GNSS Receiver
✓ 1× Rechargeable Li-ion Battery
✓ 1× Dual Port Smart Charger
✓ 1× GNSS Survey Antenna
✓ 1× Antenna Cable
✓ 1× Data Transfer Cable (USB)
✓ 1× Rugged Carrying Case
✓ 1× Quick Start Guide
✓ 1× Calibration Certificate
✓ 1× Tools and Accessories Kit

Note: Optional accessories sold separately.

Frequently Asked Questions

General

✓ What positioning accuracy can I expect from the Alpha 4i GNSS Rover Set? ▾

The Alpha 4i delivers centimeter-level positioning accuracy with RTK corrections. In optimal conditions with multi-constellation tracking (GPS, GLONASS, Galileo, BeiDou), you can achieve horizontal accuracy of ±8mm + 1ppm and vertical accuracy of ±15mm + 1ppm. The 90-degree tilt sensor maintains accuracy even when the pole is not perfectly vertical.

✓ How does the 90-degree tilt sensor improve field productivity? ▾

The integrated tilt sensor automatically compensates for pole inclination up to 90 degrees, eliminating the need to perfectly level the rover for each measurement. This significantly reduces measurement time and allows for single-person operation in challenging terrain or confined spaces where maintaining vertical pole position is difficult.

✓ What connectivity options are available for RTK corrections? ▾

The Alpha 4i supports multiple connectivity methods including internal 4G LTE modem, Wi-Fi, Bluetooth, and UHF radio. It's compatible with NTRIP correction services and can receive RTK data from base stations or correction networks. The system also supports long-range radio communications for baseline distances up to 20km.

✓ How durable is the Alpha 4i for harsh field conditions? ▾

The Alpha 4i features IP67-rated protection against dust and water immersion, operating reliably in temperatures from -40°C to +65°C. The ruggedized housing is designed to withstand drops and impacts typical in surveying environments. The system includes anti-shock mounting and corrosion-resistant materials for long-term field reliability.

✓ What software compatibility does the Alpha 4i offer? ▾

The Alpha 4i is compatible with major surveying software platforms including Carlson SurvCE, TopSURV, FieldGenius, and MicroSurvey FieldGenius. It supports standard data formats and protocols, ensuring seamless integration with existing workflows and CAD software. The system also includes Alpha's proprietary field software with advanced stakeout and data collection capabilities.

Still have questions? Contact our technical support team.

Shipping:

Origin: We fulfill orders from our global logistics network / production centers.
Typical delivery times:
- US & EU: 7–12 business days
- Global: 10–15 business days
Tracking: Every shipment includes end-to-end tracking.
Duties & taxes: Calculated at checkout where available, or payable upon import per local rules.
Dispatch time: Usually 1–3 business days after order confirmation (we’ll notify you if an item needs extra prep).
Partial shipments: If a multi-item order is ready in stages, we may ship available items first.

Returns:

Return window: 14 days from delivery for unused items in original packaging (exceptions: consumables and custom builds).
Return address: We’ll provide a regional return address when you open an RMA (US or EU where applicable).
Refunds: Processed within 5–7 business days after inspection.
Exchanges: Fast replacement dispatch once the RMA is approved.

Warranty & Service:

Coverage: All instruments include manufacturer warranty.
Support: Remote onboarding (setup call + quick-start materials) and priority email support.
Repairs & calibration: We coordinate with authorized service partners as needed.

Support

Manufacturer warranty: All instruments include official warranty per brand policy.
Remote onboarding: We help you get started—video call + setup checklist + quick-start PDF.
Technical support: Priority email response; diagnostic help for connectivity, firmware, and workflows.
Repairs & calibration: We route service through authorized partners; we’ll coordinate logistics and keep you updated.

FAQ

Q: Where are you located?
A: Metricop is a specialized online store registered in the US & EU. We ship globally with tracking.

Q: Where do you ship from?
A: From our global logistics network / production centers. Typical delivery for US/EU is 7–12 business days (global 10–15).

Q: Do you offer warranty?
A: Yes - manufacturer warranty on all instruments. We also provide remote onboarding and coordinate service with authorized partners.

Q: How do returns work?
A: Start an RMA within 14 days of delivery. We’ll provide a regional return address (US/EU where applicable).

Q: Can I get a formal quote?
A: Yes - use Request for Quote. We typically reply within 2 business hours.

Q: Payment methods?
A: Major cards and bank transfer. For business purchases we provide tax-compliant invoices.

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