![]() Even most of the VOR station use distance-measuring equipment that enables the receiver to calculate its exact distance from the station. However, VOR is a little more developed than ADF in which stations or the beacons transmits signals of two different wave length and these are later calculated to determine the distance of the receiver from the station by relating to the true north. Here the pilot uses he ADF navigation unit that points to the station. Then s/he draws two other lines by taking another beacon that shows the position of the aircraft at the intersection point. Pilots use these bearings and draw a line on the map to calculate the distance of the bearing to the beacon. The relation of aircraft and the station is known as the bearing to the station and that can be calculated on the basis of Relative Bearing (RB) or the reading of ADF and Magnetic Heading (MH). These are colored dots depicted on the aeronautical charts and a rectangular magenta box near the symbol represents the name of the station. ADF is based on non-directional beacons (NDBs) on the ground. Prior to the advent of Global Positioning System (GPS) the two common methods of navigation that pilots frequently used are the Automatic Direction Finder (ADF) and the VHF Omni-directional Range (VOR). Where as in case of VFR pilot moves forward by using direction, speed, time and distance of travel along with visual observation. In case of IFR, the pilots are permitted to navigate with the help of instruments and other radio navigation devices. Aircrafts are generally navigated under the Visual Flight Rules (VFR) and the Instrument Flight Rules (IFR). So it’s important for the pilot to know the exact location of the aircraft time by time. ![]() We know it’s really impossible to determine the position of an aircraft at such a high speed and depends on their amount of fuel for their safety. The principal aim of air navigation is for successfully piloting the airplane without getting lost, breaking aircraft laws or endangering the safety of the passenger. ![]() How GPS is Different from ADF & VOR in Air Navigation
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