@chenmm Add me to the list of people who are frustrated with Suunto maps. To make it worse, when I bough Race S in October 2024 and later when I bough Race in March 2025, maps used to be more detailed. For example trails were visible on two additional zoom levels.
But as Suunto was about to release Race 2 with much more powerful hardware, map rendering was changed in update 2.43.8 without any mention in the release notes and the level of details has became worse, especially for those of us who do activities on trails - hikers, trail runners, MTB riders, etc.
See https://forum.suunto.com/topic/13311/map-rendering-and-trail-visibility-after-software-update-2.43.8-.12
Out of curiosity I compared map sizes before and after the change, but I couldn’t see much difference. This was based on some screenshots of the app map download screens in this forum from a year ago and comparing that to what we have now. Map sizes remained roughly the same.
With regards to your comment about wasting the download size on 4 different map styles, I don’t think that is the case. It has been confirmed that Suunto maps are vector based, meaning that the same map data is fed into the rendering regardless of the map style, and different colors are applied at the last moment. Garmin map rendering works the same way. I would be surprised if it was any different. I don’t how what is the reason for the large map download sizes. They are very large indeed compared even to Garmin maps that are much more detailed. Perhaps the compression is not very good because of the small tile sizes. I can only guess. But on other hand, I guess higher compression ratio could lead to more CPU work during map use resulting in worse performance and higher battery use.