你的硬币和电池就是非常简单的无线电发射机，这台发射机虽不能传输很远，但如果你对莫尔斯电码略知一二，你就可以用这个装置进行联络。

Your coin and battery are a very simple radio transmitter. This radio will not transmit very far. However, if you know a little of Morse code, you could communicate with this device.

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比如：你也许注意到岸上的无线电发射塔和你的比赛目标在一条直线上，那么比赛中你就可以用这个发射塔作为参照。

For example, you might notice that a radio tower is in line with the buoy you're aiming for, and you can use that tower as a reference point during the race.

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