HEX Here3+ RTK-GPS with iStand - DroneCAN Multiband GNSS for Pixhawk & Cube
In the 2026 drone landscape, standard GPS is no longer enough for industrial missions. The Here3 is an all-in-one solution that integrates a GNSS receiver, a high-precision compass, a status LED, and a safety button into a single dust- and splash-proof housing.
Key Technical Advantages:
DroneCAN Architecture: Unlike older I2C/UART sensors, the Here3 uses the DroneCAN (formerly UAVCAN) protocol. This allows for high-speed, reliable data transmission over longer cable lengths and enables multiple GNSS units to work in parallel for true redundancy.
Centimeter-Level RTK: When paired with a base station, the Here3 achieves horizontal positioning accuracy in the centimeter range. This is essential for precision agriculture, automated landing, and repeatable mapping missions.
iStand Elevation: The included iStand isn't just a mount; it’s a critical piece of hardware. By elevating the GNSS unit, it minimizes the "compass variance" errors caused by high-current battery wires and motor magnetic fields, leading to much more stable loitering.
Integrated Safety Features: The built-in safety switch allows for ground-side arming, while the high-brightness RGB LED provides instant visual feedback on GPS lock, flight mode, and aircraft health.
Future-Proof Processing: The internal processor has been upgraded in the "Plus" version to handle the 2026-standard CAN-FD (Flexible Data-rate), ensuring compatibility with the next generation of flight controllers.
Frequently Asked Questions (FAQ)
1. What is the main difference between the Here3 and the Here3 ?
The Here3 features an upgraded processor that supports the DroneCAN (formerly UAVCAN) protocol. This allows for significantly higher data rates and better reliability compared to standard I2C or Serial connections. It also features improved internal filtering to better handle noise from high-power ESCs and video transmitters.
2. Does the Here3 provide "Centimeter-Level" accuracy out of the box?
To achieve centimeter-level precision, the Here3 must be used in an RTK (Real-Time Kinematic) setup. This requires a "Base Station" (like the Here Base) on the ground to send correction data to the "Rover" (the Here3 on your drone). Without a base station, it functions as a high-quality, multi-constellation GNSS with sub-meter accuracy.
3. What constellations does the Here3 support?
It is a multi-band, multi-constellation receiver. It can simultaneously track GPS (USA), GLONASS (Russia), BeiDou (China), and Galileo (Europe). This ensures that even in challenging environments like deep valleys or urban canyons with tall buildings, the drone maintains a high satellite count for a stable position hold.
4. Why is the DroneCAN protocol better for industrial drones?
Standard cables can be prone to signal degradation over long distances. DroneCAN is a robust, differential signaling protocol designed for the harsh electrical environments of drones. It allows the Here3 to be mounted further away from the flight controller (on the included iStand) without losing data integrity, which reduces interference from the drone's metal frame and electronics.
5. Is the iStand included, and why should I use it?
Yes, the iStand is included in this kit. Mounting your GPS on a stand is a "Pro" best practice because it moves the sensitive magnetometer (compass) away from the high-current wires and motors of the drone. This prevents "toilet-bowling" effects and compass variances during high-throttle maneuvers.
