Question: when were the first magnetic compasses used by chinese ships
[{'answer': '1040 -- 44'}, {'provenance': [{'wikipedia_id': '50466674', 'title': 'History of the compass', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 290, 'bleu_score': 0.8879659171421961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5828312757723643308}, 'section': 'Section::::Early navigational compass.:China.\n'}]}]