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GPS module Holybro H-RTK Unicore UM982 (dual antenna, direction determination) The Holybro UM982 GPS module with dual antenna provides high-precision position information and enables determination of the direction of movement without the use of a magnetometer with a single GPS unit. One of the main advantages of this GPS is the ability to provide heading information (YAW) without a compass, also known as "GPS Heading" or "Moving Baseline Yaw". This eliminates interference from electric motors, wiring, or metal structures that commonly affect magnetometers. This feature works even if the GPS is not receiving RTCM data from a fixed RTK station or NTRIP server. The module is based on the Unicore UM982 (NMEA) GNSS module and supports centimeter-accurate RTK corrections. Compatible with GPS/GLONASS, Beida, Galileo and QZSS. It also includes a magnetometer, an LED diode and a safety button. The module can be used both as a GPS rover and as a base station for transmitting RTCM data to the ground control system. Note: Status LED control has been changed. LED is supported from PX4 1.14, ArduPilot 4.4.0 and higher. Specifications: Use: - Rover; - Rover with determination of the direction of movement (Moving Baseline); - Base station (recommended to use H-RTK F9P-Base as base). Compass: - IST8310 GNSS: - BDS B1I/B2I/B3I - GPS L1C/A/L2P(Y)/L2C/L5 - GLONASS L1/L2 - Galileo E1/E5a/E5b - QZSS L1/L2/L5 RTK Accuracy (RMS): - Horizontal: 0.8 cm + 1 ppm - Vertical: 1.5 cm + 1 ppm - Speed: 0.03 m/s DGPS Accuracy (RMS): - Horizontal: 0.4 m - Vertical: 0.8 m - Direction: 0.1°/1 m baseline Accuracy of single positioning (RMS): - Horizontal: 1.5 m - Vertical: 2.5 m Antenna gain (max): - 2 dBi LNA gain (typically): - 33 ± 2 dB Time for first fixation: - Cold start: ≤ 30 s - Warm start: ≤ 5 s RTK Survey-In Time: - ≤ 5 minutes at 2.0 m CEP Data and update frequency: - 20 Hz positioning and direction determination - 20 Hz observation of raw data Ports: - Port 1: GH1.25 10pin - Port 2: USB Type-C - Port 3: UART2 (GH1.25 6pin) Cable length: - Board: SMA female - Antenna: SMA male Transmission speed (adjustable): - Default: 230400 baud, 5 Hz Operating voltage: - 4.75V ~ 5.25V Current consumption: - ~350mA Dimensions: - Board: 34.8 × 58.9 × 14.4 mm - Antenna diameter: 27.5 mm - Antenna height: 59 mm Weight: - 37.9 g (without antennas) The package contains: 1 x H-RTK UM982 2 × High precision helical antennas 2 × Antenna holders 2 × SMA cables (40 cm) 2 x JST-GH cables 10pin – 10pin 1 x JST-GH cable 10pin – 6pin 1 x JST-GH cable 6pin - 6pin