18 March 2016 Current Affairs: The India Meteorology Department (IMD) has indigenously developed Drishti, an instrument that will provide real time visibility information to pilots. The instrument will help pilots in quick decision-making during critical landings and take-offs of aircraft particularly during foggy or rainy days.Drishti, an instrument indigenously developed by the surface instruments division of India Meteorology Department (IMD), Pune, has enabled in transferring the crucial visibility updates to the pilots, who can now use this real time information that will be updated every minute. It is a transmissometer that takes in account the real time weather parameters like wind speed, humidity, temperature conditions, etc., along the runway in order to calculate the visibility distance offered at that particular runway. The need for this instrument was felt as airports in north India are severely affected due to fog during the winter months.Elaborating about the advantages of Drishti, Deputy Director General (surface instruments) RR Mali Earlier, due to the poor visibility, the aircraft operations would often get disturbed, affecting passenger traffic during winter and monsoon seasons.However, this situation has changed drastically and now with the real-time information also being available, pilots can make quick decisions. Most of the airports in north India including those at New Delhi, Jaipur, Varanasi, Lucknow, Amritsar and Kolkata in the east now have this specialised facility, aiding the pilots for smooth navigation along the runway. After getting introduced first at the Indira Gandhi International Airport (IGI) in New Delhi in 2015 on a trial basis, the instrument was, in a phased manner, installed at locations that often experience fog. At present, there are 10 instruments at Delhi, three each at Jaipur, Varanasi, Lucknow; one each at Amritsar and Kolkata. The proposal for setting up this system in airports in south India is on the cards.