The radio transmitter can send signal to the navigational hazards that are possible. This has been critical to the days when communication was not modern.
Because of the radio telegram can send a signal telling the boat people to the danger arose, that is extremely important to the era of modern communications, not yet.
Due to the radio signal can be sent telegram said, walking up to the boat, the calamities can occur, which is very important to communicate to the era in which is not up-to-date