Under Visual Flight Rules, pilots use a map and compass, and look on the ground. When preparing for a flight they choose big visible points on the map, for example large cities, lakes, hills, rivers, roads or forests. When in the air, they seek the chosen points to make sure of going the right way way. The weather must be good enough to let them see the ground. They cannot fly into clouds, because they can get lost. Pilots also have to look for other aircraft. It is their responsibility to make sure they do not get too close to other aircraft. This is called "see and avoid". 