@Tieutieu yep.
Present: altimeter is calibrated either by GNSS signal, or manual user calibration.
Suggestion: the maps have topo lines, which suggests the maps have elevation data. Let’s assume they do, and it’s queryable, and not just in the GUI. A 3D GNSS fix takes a lot more time than a 2D GNSS fix. With a map and elevation data, and a 2D fix, you can infer altitude with a reverse lookup: what is the altitude on the map for this lat/long?
Not only does this give us known-accurate elevation data, but the benefit that our barometer is more likely to be accurate, too, as currently the data from the manometer has to be parsed to determine if the change is elevation or barometric pressure. FusedAlti is great, but, why infer when you can calculate?
Unless you meant the espresso maker…?