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The task of the harbor stations, then, is to listen both on a six-hundred-meter range, and one of nine hundred and fifty-two the first wave length for commercial and the latter for Navy ship's calls. Then in response to inquiry the operator directs the vessel how to enter that particular harbor, stating just where the entrance buoys are and where the channel lies.
"After being in radio work and seeing the opportunities there are for mistakes I have decided operators cannot be too careful. You see it is not like talking with a person face to face. Those you are communicating with are usually miles and miles away. Such stations as I have been telling you about are on the lookout for any six-hundred-meter calls and they answer in this tune.
After communication with a ship is established, however, the tune shifts to seven hundred and fifty-six meters if a Navy vessel should be talking; if not, the six-hundred-meter wave length assigned is used. This leaves the shorter range waves to commercial vessels and greatly simplifies matters." "That is a good rule, too," chimed in Mr. Crowninshield.
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