The Navisys GM-M04B is a high-performance L1/L5 dual-band GNSS Smart Antenna Module designed for reliable positioning in industrial and embedded applications.

Powered by the latest 12 nm AG3335 platform, the GM-M04B supports all major civilian GNSS constellations, including GPS, GLONASS, Galileo, BeiDou, QZSS, and NavIC. The integrated compass system, combined with concurrent L1/L5 dual-band reception, delivers faster and more reliable positioning while improving accuracy compared to conventional single-band GNSS receivers.

The GM-M04B integrates a high-performance dual-band GNSS antenna, compass module, backup battery, status LED, and wire-to-board connector into a compact plug-and-play design, reducing system integration effort while delivering dependable performance in demanding environments. 

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Applications

• Navigation (Automobiles, Trains, Boats, and Pedestrians)
• Electronic Logging Devices (ELD)
• Precision Timing
• Femtocells
• Traffic Light Timing Systems 

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Multi-Constellation GNSS

• 135-channel GNSS receiver
• Concurrent L1/L5 dual-band reception
• Supports GPS, GLONASS, Galileo, BeiDou, QZSS and NavIC
• SBAS support (WAAS, EGNOS, MSAS and GAGAN)
• SLAS (Sub-meter Level Augmentation) support in Japan 

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High-Performance Positioning

• Tracking sensitivity: -165 dBm
• Smart jammer detection for GPS, GLONASS, Galileo and BeiDou
• 12 multi-tone Active Interference Cancellers (AIC)
• Indoor and outdoor multipath detection and compensation
• PPS output with ±10 ns accuracy
• Up to 10 Hz update rate 

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Integrated Smart Antenna

• All-in-one plug-and-play smart antenna module
• Built-in L1/L5 dual-band GNSS antenna
• Built-in wire-to-board digital connector
• Built-in backup battery for faster position fix
• Built-in position status LED
• Built-in compass, BMM350 (±2000 μT, 3-axis) 

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AGPS / AGNSS Support

• RTCM ready (v2.3 and v3.3)
• AGPS / AGNSS support
• EPO™ (Extended Prediction Orbit)
• EASY™ (Embedded Assist System)
• LOCUS™ logger function 

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Industrial Design

• Fully EMI shielded
• External backup power option via I/O pin for high-temperature applications
• Industrial operating temperature: -40°C to +85°C 

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Technical Specifications

Receiver Performance Data

Item	Specification
Receiver Type	135 channels
Frequency Bands	L1: GLONASS L1OF (1602 MHz), GPS/QZSS L1 C/A (1575.42 MHz), SBAS L1, QZSS L1 SAIF, Galileo E1 (E1B+E1C), BeiDou B1I (1561.098 MHz)L5: GPS/QZSS L5 (1176.45 MHz), Galileo E5a, BeiDou B2a, NavIC SPS
Horizontal Position Accuracy	1.5 m (L1+L5 dual-band), 50% 24-hour static, -130 dBm
Vertical Position Accuracy	2.25 m (L1+L5 dual-band), 50% 24-hour static, -130 dBm
Velocity Accuracy	<0.05 m/s (Autonomous), 50% @ 30 m/s
Time Pulse Signal Accuracy	±10 ns (Clear Sky, 1 Sigma)
Time to First Fix	Hot Start: 1 secWarm Start: 24 secCold Start: 24 sec
Sensitivity	Acquisition: -148 dBmTracking: -165 dBm
Maximum Update Rate	10 Hz (Default: 1 Hz)
Maximum Altitude	<18,000 m
Maximum Velocity	<1,852 km/h
Protocol Support	NMEA V3.01 & V4.10GGA, GSA, GSV, RMC, VTGUART: N-8-138400 / 115200 (Default) / 921600 bpsProprietary PAIR CommandProprietary Binary Sentence
SBAS Support	WAAS, EGNOS, MSAS, GAGAN
AGPS / AGNSS	EPO: GPS, GLONASSQEPO: GPS, GLONASS, Galileo, BeiDouEASY: GPS
Dynamics	<4 g

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Compass BMM350

Item	Specification
Magnetic Field Range (Typical)	±2000 μT (All Axes)
Resolution	16-bit
Maximum Sample Rate	400 Hz (Normal Mode)

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Electrical Data

Item	Specification
Power Supply (VCC)	3.3 ~ 5 V (TTL)
Power Consumption	56 mA (Average Tracking, 77 SV in Fix)
Backup Power (V_BAT)	2 ~ 5 V
TTL I/O	VIH: 2 ~ 3.15 VVIL: 0 ~ 0.8 VVOH: >2.1 VVOL: <0.72 V

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Environmental Data

Item	Specification
Operating Temperature	-40°C to +85°C (Battery: -20°C to +60°C)
Storage Temperature	-40°C to +85°C (Battery: -40°C to +60°C)
Vibration	5 Hz to 500 Hz, 5 g
Shock	Half Sine, 30 g / 11 ms

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Mechanical Specifications

Item	Specification
Dimensions	30 × 30 × 11.8 mm
Weight	19.2 g

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6-Pin Interface (1.0 mm Pitch)

Pin	Name	Function	I/O
1	GND	Ground	Input
2	VCC	Power Supply	Input
3	TXD-TTL	TTL Serial Data Output	Output
4	RXD-TTL	High/Floating: ON, Low: OFF	Input
5	I²C_SCL	I²C Clock of Compass	Input
6	I²C_SDA	I²C Data of Compass	I/O

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Package Content:

• Navisys GM-M04B GNSS Module x 1

• USB adapter cable for Navisys Module x 1 (Optional)