The Great Circle Track crosses the Equator at 030°W for the first time on a bearing of 035°T. Being a Great Circle, the next time it crosses the Equator will be exactly opposite the first point.

030°W + 180°= 150°E

The track at this point will be 035°T + 180°= 215°T

The highest latitude reached will be half way between these two points:

030°W + 90°= 060°E

Draw a circle with a horizontal line to represent the Equator and a dot in the centre to represent the centre of the earth. Draw a vertical line from the central dot to the North Pole.

Draw a third line to represent the Great Circle at an angle of 035° from the vertical line. The remaining angle between the third line and the Equator = 090° - 035° = 055°.

Therefore, this third line crosses the surface of the earth at a latitude of 55°N.