Accuracy of WebODM orthophoto measurements

Good day all

I am a PhD student in South Africa and I am using WebODM to measure features in rivers. Ive been using WebODM with images from my Mavic mini (not the ideal drone but its what I have at the moment).
I have been flying at 60m altitude with Dronelink as the software for flight planning and using the default WebODM settings to process images. Dronelink states 2.3 cm/px GSD.
How do I know what the accuracy of measurements from orthophotos are, so basically the “error” in length measurements?
Any help would be appreciated. And let me know what details you require.

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