Question: Flying an aircraft with a Fixed Card ADF. To determine position, you decide to use 2 NDB stations.
NDB 1 - Select a RB = 120 Degrees
NDB 2 - Select a RB = 260 Degrees
Aircraft Heading = 220 Degrees
Local Variation = 23 Degrees West
In order to determine your position from the RBs, what would you plot on NDB 1 and NDB 2 on the chart?
Answers:
1. 160 and 300
2. 340 and 120
3. 137 and 277 (correct answer)
4. 83 and 323
Assuming that Variation is the same for all three locations, that the Aircraft heading is Magnetic (M), and that the answers are required in Degrees True (T):
Relative Bearings(RBs) are 'To' the beacons, so take the reciprocals to get bearings 'From' the beacons:
1 RB 120 = 300 'From'
2 RB 260 = 080 'From'
Bearing from Beacon 1 = 300 + Hdg 220 - 360 = 160M or - V 23 W=
137T Bearing from Beacon 2 = 080 + Hdg 220 . . . . = 300M or - V 23W =
277T
Hope that helps.
MJ
