If declination is 18 degrees West, 246 degrees True converted to a magnetic bearing is?

To convert a true bearing to a magnetic bearing when given a declination, you need to understand how declination affects the relationship between true north and magnetic north. Declination indicates the angle between true north (geographic north) and magnetic north. In this case, if the declination is 18 degrees West, it means that magnetic north is located to the west of true north.

To find the magnetic bearing, you would subtract the declination from the true bearing because you are adjusting to move from true north to magnetic north. In this scenario, the true bearing is 246 degrees.

Performing the calculation:

246 degrees (True bearing) - 18 degrees (West declination) = 228 degrees (Magnetic bearing).

Therefore, the correct answer is 228 degrees, not 264.

The other options do not reflect the correct method of adjusting for the declination, which leads to inaccuracies in the conversion process. To clarify further, adding the declination would have been appropriate if the declination were to the east, which is not the case here. Thus, the proper calculation gives us 228 degrees as the magnetic bearing.