Just at my own expense. The word navigation is widely used in general aviation, helicopters, small passenger planes, civil aviation and other fields. The tuition fee for pilots who learn to sail and fly is 748,000 yuan, and the tuition fee for pilots who borrow at their own expense is 248,000 yuan. Navigation is only at your own expense. Navigation, pronounced as tōng háng, is a Chinese word, which means to open aviation and navigation routes, and is also the abbreviation of the word "general aviation". In recent years, because the country is open to low altitude, the word navigation has been widely used in general aviation, helicopters, small passenger planes, civil aviation and other fields. "Navigation" is usually called general aviation, which is referred to as navigation for short.