The iPhone Maps Application is allows you to view and search Google Maps. It also lets you see traffic reports in some cities, satellite views, and will give you directions from one location to another.
The main screen for Maps has a search field at the top and a few buttons at the bottom. Press the search field to bring up the keyboard. Then enter a location. You can enter a specific address, a zip code, the name of a city and state, or any search term to allow Google Maps to take its best guess.
Moving around the maps is done by pressing and dragging on your screen. You can zoom in by pinching the screen, and zoom out with the opposite gesture.
To get directions, press the Directions button at the bottom of the screen. You will now have two search fields at the top. Enter something in each field. You can use the squiggly button at the left to swap the fields.
You can then press the Edit button to change the start or end locations, or use the Start button to see the first step in following the directions. Arrows will then replace the Start button and allow you to go through the directions step-by-step.
The iPhone can also find your current location with varying degrees of accuracy. Press the bulls-eye button at the lower left.
You can enable more Maps features by pressing the eye button at the bottom right. This brings up more options, such at the ability to drop a pin in the map at the current location, and to turn on traffic reports. You can also switch from map view to Satellite image view, or use a hybrid of map and imagery. The List view can be used when you are getting directions and simply wish to see a list of all the of the steps on one screen.
The traffic reports show up as green, red and yellow lines, usually on interstate highways in major cities. You may have to zoom out quite a distance to see them.
The Satellite and Hybrid views will show satellite pictures of the area. Different areas may have different quality and levels of depth.