The prototype device they have near the end - looks like a raspberry pi + GPS receiver? The only possible reason I can think of for that is to get higher accura

The prototype device they have near the end - looks like a raspberry pi + GPS receiver? The only possible reason I can think of for that is to get higher accuracy GPS than a smartphone, but is it that much more accurate? And is that accuracy that useful? I can think of a bunch of Bicycle User Groups here in Melbourne (AU) that would help contribute to initiatives like this (while AU is generally better than US for cycling, there's still a _long_ way to go), but I would think an app would make it much more scalable than hardware (also, are there not external GPS receivers available for phones)? My other thought is, once there's a decent set of data like this, how is it updated? While road alignments don't change that often (so car routes don't need to change often), the small-scale details like this change much more frequently