1. A line making the same oblique angle with all fictitious meridians of an oblique Mercator projection; oblique parallels and meridians may be considered special cases of the oblique rhumb line.

2. Any rhumb line, real or fictitious, making an oblique angle with its meridians; in this sense the expression is used to distinguish such rhumb lines from parallels and meridians, real or fictitious, which may be included in the expression ``rhumb line.''