Using Online Maps
Touch the Map Folder icon on the toolbar. This initially shows a list of the maps that cover the current center of the screen. If you have just started, there is probably just the one map listed there.
Touch the More Maps button, and select Digital Map Store. This displays a range of maps for the currently viewed location that are available for download.
By default, the listing is just for topographic maps and small-scale base-maps. If you are looking for marine charts, historical maps, or any other specialist maps, tap the Map Types button and turn on the type you want to access.
If you select a map that has to be bought via Apple's in-app purchase mechanism, the standard iTunes prompt gives you the price and allows you to buy it. Your map is unlocked and displayed on the screen, without any need to create an account with Memory-Map. The map is licensed for up to 5 iOS devices that you use in the same iTunes account.
If you have a Memory-Map account, you have to sign in before all your maps will appear in the map list. Go to the Flip side, tap Settings, Map License, Sign in.