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compass
He probably took a compass to help navigate on his voyage
A Chinese Compass a Luo Pan) is used by a Feng Shui Master in order to orient the house, its doors, windows and contents (particularly mirrors and reflective surfaces) in order to maximize best outcomes for the residents. The compass was first also used to find a burial spot. The compass was first used by fortune tellers the most. Later on the compass was also used for navigation. Traders, Sailors and any other person whose job had to do with traveling used the compass.
They used the astrolabe and compass. The astrolabe was invented by Muslims, and the compass by the Chinese.
A navigational tool with a needle is a compass because it helps you to navigate which is cosidered as a tool. A compass has a needle inside to point which way is north. There is your answer :)