The basics
The compass
The compass, along with the map, helps you to navigate and figure out where you're heading.
The map
The map is your best friend. It shows you where you are, and where you're heading.
The control
The control is what you are looking for. Chances are you'll be really pleased once you find it.
The gear
As with a lot of other sports, orienteering has its own kind of gear: shoes, headlamps, map holders etc.