It is accurate to within 0.03mm. The same sensor is used on a boat to shine a beam off the tiller bar, using the reflection to measure the Angle of the rudder.
这个感应器非常精确在0.03毫米内，同样的感应器也用在船只上去投射舵柄连接杆发出的电波，利用反射去计算舵的角度。
Tillers are more commonly used on smaller sailboats because it can take much force to move the larger rudder of a big boat with a tiller.
舵柄在小型船只上使用得更广泛，因为对于大船来说转动舵柄来掌舵需要太大力气了。
Her right shoe is connected to a cable that runs through the rear cabin and hooks into the tiller, which is screwed to the rudder, so she can steer as she rows.
她右边的鞋子与一根钢丝绳相连，而这根纲丝绳一直通到后面的船舱与船舵相连，这样她在划船时能够掌舵。
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