Most maps here are 24k. Most maps here are not routable. Unless you have purchased your 24k maps on a DVD, and are storing them on a microSD card of your own, you should keep Garmin's 24k maps (on a Garmin Card) separate from third party maps like those you find here. If you are interested in maps of the Southwestern US, the maps I've made are routable, except for the "Transparent" ones.