GoSkywatch Planetarium for iPad gets me around the sky quite nicely.
You point your iPad at a hunk of sky, and the App tells you what you're looking at; or you can switch off the magnetometer and use the map as a conventional atlas.
The star atlas doesn't go much beyond magnitude 6, if that, but there's a decent collection of deep sky objects, nebula, clusters, galaxies, included.
The App'll also tell you which constellation is currently directly under your feet. 😉