Question: Mao Kun map is often seen as a surviving document from the expeditions of the mariner whose ships could stretch past what length?
Sentence (from "Zheng He"): Zheng He (1371–1433 or 1435), formerly romanized as Cheng Ho, was a Hui Chinese mariner, explorer, diplomat, fleet admiral, and court eunuch during China's early Ming dynasty.
Relevant evidence: Yes