Accuracy of the GLRM?

GLRM
1

Hey guys,

What’s the actual accuracy of the GLRM? Can anyone share the exact numbers/specs?

Thanks!

2

Hey Kevin, thanks for reaching out!

When configured with standard RTK corrections, the GLRM delivers baseline positioning accuracy of 7 mm + 1 ppm horizontally and 14 mm + 1 ppm vertically. In PPP mode without real time base corrections, accuracy is 50 mm + 1 ppm horizontally and 100 mm + 1 ppm vertically. Its internal IMU sensor handles rapid tilt compensation, maintaining accuracy under 20 mm even at a 60° tilt angle. With a multi constellation, 1,400+ channel receiver, it typically locks onto an RTK fix within seconds.

To configure and manage the receiver in the field, you can use our free GL Connect app (available on iOS and Android). It connects via Bluetooth to handle live NTRIP corrections, constellation tracking, position mapping, firmware updates, and mock location output for third-party GIS software.

Hope this helps, let us know if you have any more questions!

3

Thanks for the quick response!

Out of curiosity, could you explain a bit more about how PPP mode actually works? How does it get precise coordinates without needing a base station or NTRIP corrections, and when would you use it instead of standard RTK?

4

Happy to explain!

PPP stands for Precise Point Positioning, and the main difference between it and standard RTK is how corrections are delivered. While RTK relies on a local physical base station or an NTRIP network to calculate real-time relative corrections based on a known nearby location, PPP operates globally without any local infrastructure. Instead, it calculates your position using high-accuracy satellite orbit and clock corrections delivered directly via satellite broadcasts or internet data streams.

Basically, your receiver takes these global orbit and clock models and uses advanced algorithms to independently resolve atmospheric delays, earth tides, and antenna phase shifts right on the device. Because it has to calculate all these variables from scratch without a reference station, PPP takes a short warm-up period (typically around 10 to 30 minutes) to “converge” down to its target decimeter accuracy. This makes PPP the perfect fallback tool when working in remote or off-grid locations where there is no cellular coverage for NTRIP and setting up a local base station isn’t feasible.

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