When would a jack-up drilling rig be considered "underway" under the International Rules of the Road?

Correct Answer: Option A — When it is being towed to a new location

Under the International Rules of the Road (COLREGS Rule 3), a vessel or MODU is "underway" when she is not at anchor, made fast to the shore, or aground. Therefore, a jack-up rig being towed to a new location meets this definition.