Answer:
Raising and lowering of arms in a boat can be seen as distress signal, which is also known as a distress call. It is recognized as a means of obtaining help and could be in any form. Basically, transmitting of radio signals, displaying a virtually observable items or illumination, making a loud sound from a distance are various means by which distress calls can be communicated.
A distress calls is showing that a person or a group of people is faced with a serious dangerous situation that requires an immediate intervention of a capable hand.
Important parameters should be communicated in order for a distress signal to be most effective
In the case presented in the question, it appears the person needs assistance or desperately looking for help. Although it is not advisable to assume the person needs help without carefully assessing the situation around the scene.
The individual that wants to help in this situation should not near the scene unless it safe. However, if the scene appears unsafe, the individual should take a step further by alerting someone who is likely to help or by calling the attention of the appropriate authority.
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