Using the altimeter readings, they know how high above ground they are and whether or not they can fly safely over mountains and other obstacles. Special navigation radios give pilots precise information which, with the help of special maps, tell them their exact position. The number of nonflying duties that pilots have depends on the employment setting. Airline pilots have the services of large support staffs, and consequently, perform few nonflying duties. Pilots employed by other organizations such as charter operators or businesses have many other duties.
Some pilots are instructors.
They periodically fly with other pilots or pilot's license applicants to make sure that they are proficient. By law, airline pilots cannot fly more than 100 hours a month or more than 1,000 hours a year. Most airline pilots fly an average of 75 hours a month and work an additional 75 hours a month performing nonflying duties. Fifty percent of all pilots work more than 40 hours a week. The majority of flights involve overnight layovers.