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。

youdao

What if I shine a beam of light at you on the bank from my boat?

那如果我从船里投射一束光到岸上的你那儿？

youdao

And Little Jack Rollaround sailed his trundle-bed boat up the beam, through the keyhole, and into the street.

小杰克摇摇乘着他的矮床帆船沿着光束向上穿过锁眼，来到门前的街上。

youdao

Last fall, Artemis said the front beam of the catamaran was damaged during structural tests, delaying the boat's christening.

NPR: America's Cup Expected To Go On After Fatal Wreck

With no agreement on what type of boat to race, the Deed of Gift governing the Cup defaults to 90-foot boats of unlimited beam, or width.

FORBES: Ellison Bets On Pure Speed For Next America's Cup