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@andyp
To give some context, when I was working on a GPS cycling device project, we had limited storage space for map tiles. Out of the box we could cover the globe down to zoom level 10, but for turn by turn navigation you'd need zoom level 16 as a minimum. We had to make the decision that the user would be responsible for selecting the tiles needed, via route planning and download (although this would happen automatically if you downloaded a route to the device).
I've not looked at how Wahoo do this, but the issue sounds similar.