MAX_
The zoom level and grid size were constant when using soundscape-backend at 16 and 3 respectively. With protobuf tiles the tile grid for walking around will be 15 and 2, but we can also have a lower zoom level to allow us to give better context when we're travelling by faster means of transport e.g. inter city train. The lower zoom levels mean that we can search for the nearest village or town instead of just the nearest street or road.