Question: When were the first magnetic compasses used by chinese ships?
Disambiguated questions and answers: question: When were the first magnetic compasses used by Chinese ships for maritime navigation?
When were the first magnetic compasses used by Chinese ships for navigational orienteering?
answer: 1111-1117
1040-1044
1040 -- 44
Natural Questions answer: 1040 -- 44 (from the Wikipedia article "History of the compass")