ADF Position fixing is achieved how?

ADF Position fixing is achieved how?

• A. By plotting a two-station fix
• B. By using GPS trilateration
• C. By using celestial navigation
• D. By dead reckoning

Answer: (A)

The method being tested uses two bearings to known radio beacons to determine your position. With an ADF, you can measure the direction to a beacon. If you take such measurements from two distinct, known locations (two stations), you can plot two lines of position on a chart—each line extending from its respective station along the measured bearing. The point where those two lines intersect is your fixed position. This is why a two-station fix is the way ADF position fixing is achieved: each bearing narrows your location to a line, and the intersection of two such lines gives a precise position. GPS trilateration, celestial navigation, and dead reckoning don’t use ADF bearings from two known stations, so they aren’t the method described here.

The method being tested uses two bearings to known radio beacons to determine your position. With an ADF, you can measure the direction to a beacon. If you take such measurements from two distinct, known locations (two stations), you can plot two lines of position on a chart—each line extending from its respective station along the measured bearing. The point where those two lines intersect is your fixed position. This is why a two-station fix is the way ADF position fixing is achieved: each bearing narrows your location to a line, and the intersection of two such lines gives a precise position.

GPS trilateration, celestial navigation, and dead reckoning don’t use ADF bearings from two known stations, so they aren’t the method described here.