# What is the answer to this question about aircraft position based on an NDB?

An aircraft is intending to track from NDB ‘A’ to NDB ‘B’ on a track of 050° (T), heading 060° (T). If the RBI shows the relative bearing of ‘A’ to be 180° and the relative bearing of ‘B’ to be 330° then the aircraft is:

• A. Port of track and nearer ‘A’
• B. Port of track and nearer ‘B’
• C. Starboard of track and nearer ‘A’
• D. Starboard of track and nearer ‘B’

Yes, "D" is correct. A picture is worth a thousand words......

Think of it this way: the plane's heading is known, but the plane's actual track is not. Also the bearing from A to B is known-- it is the intended track.

Bearing from point A to plane = reciprocal of 60 + 180 = reciprocal of 240 = 60.

Bearing from point B to plane = reciprocal of 60 +330 = reciprocal of 390 = reciprocal of 030 = 210

Draw a sketch of A and B, with B 50 degrees from A. Draw the bearings from A and B to the plane-- the plane is located where these bearing lines cross-- and it will be clear that the plane is right of the intended track, and closer to B than A.