Thanks for the replies. I am hoping to hear something official from Waze support, as it appears Alan is. I do have trouble believing the map database is so immature or unstable as to need updating across 20% of the database each day. Were that the case, other programs that use preloaded maps would be sending people into all kinds of trouble! If the tiles ar indeed cached, it would be nice to have some control over the size of the cache, but I still contend that downloading first, then updating as necessary is the way to go. For instance, when I travel overseas, I either need to buy an expensive international data plan, or do without Waze. I'd certainly rather download the maps ahead of the trip, so that I have them in areas of poor reception, and when/if I DO opt-in for the international data plan, I'm not needlessly paying for map downloads I could've done at home!