Convert from gnat's eye to cape rood

Unit Definition (gnat's eye)
The gnat's eye is an idiomatic "unit" of distance; it's common to hear that something is "as small as a gnat's eye". In fact, the eyes of typical gnats tend to have diameters similar in size to a hair's breadth: roughly 100-150 micrometers (0.10-0.15 millimeters).

Unit Definition (cape rood)
The cape rood is a traditional unit of distance in South Africa, equal to 12 Cape feet or 12.396 English feet (3.7783 meters).