Bulgaria is a mountainous country. This is the reason for poor visibility of all satellites over the horizon. The development of GALILEO increases the number of visible satellites and hence enhances the navigation accuracy and improves the integrity. Due to its geographical location, lower availability is typical for Bulgaria. GALILEO implementation will increase substantially the availability and hence the certification of more airports for precision approach without the need of expensive ground infrastructure. This is known as “Localizer performance with vertical guidance” or LPV for short. Many LPV procedures are already published for airports in Central and Western Europe and it is expected that Bulgaria will soon join this trend.
