Here’s a Google Map of Split: use the controls on the left-hand side to zoom in and out and scroll around.
Don’t forget that Streetview is now available in Croatia – drag that little orange guy onto the map to see what places actually look like! This may well be useful if you’re trying to look up a particular sight or place of accommodation.
Below the map, you can use the directions interface to search for how to get to specific places to or from Split. This may be useful if you are looking up how to get to your accommodation, for example.