"Sir, your black tea is ready. The best Darjeeling black tea." Al Khan from British India handed a cup of steaming black tea to Major Wintour.

"Well, it's really Darjeeling black tea, not the tea powder that is usually used for the army." Major Wintour put down the telescope in his hand, and then did not forget to cover the lens, and then took the black tea sent by his assistant.

"Have Captain Gwin's observations come out over the past few days?" Major Wintour said.

"A part of the supply operation of the Americans can be described as mechanically accurate. Every time, three water replenishment boats will be dispatched. They will set off at 6 o'clock in the morning and set off on time at 7 o'clock. The entire supply process will last about 15 hours. That is to say, at 10 o'clock in the evening, the three water replenishment boats will return to the base, and then they will rest for about 3 to 5 days and then carry out the next water replenishment operation. In addition to the normal water replenishment boats, every week, there will be a supply boat to transport supplies and supplies to the US military on Christmas Island." Captain Gwin said.

"According to our estimates, the routes that large transport fleets pass by will not exceed three hours from Christmas Island. In theory, as long as we can keep a close eye on the watering vessels on Christmas Island, it will be no problem to find an American transport fleet with the Japanese fleet's reconnaissance capabilities."

"There is a small airport and seaplane dock northeast of Christmas Island. The Americans obviously also considered the safety of the Christmas Island area, so there are also seaplanes patrolling during the day, which may be a problem for our ambush fleet. After all, if we arrived early and happened to be discovered by American seaplanes, the American transport fleet would likely escape."

"Before the fleet set off, the Americans' radio waves will indeed have explosive growth. After several observations, their frequency bands and durations are relatively fixed. From this perspective, their communication content should be formatted. We can completely speculate on the general situation of the American fleet through the communication frequency bands and time of different time periods. For example, before the fleet sails, the communication time is very short, which should be to confirm whether the transport fleet has arrived at the supply position. Then about 2 hours after the fleet set off, the communication time will be relatively long, and it should be to coordinate the relevant information of the supply. After 12 hours, the communication frequency will drop rapidly, and it feels that the supply should be over and the water supply fleet is ready to evacuate." Captain Gwin said.

"Okay, it seems that we have found quite a lot of information. So let's send the information out when we contact the K4 submarine tonight. After all, we still need the K4 submarine to confirm the accuracy of the relevant information." Major Wintour said,

"By the way, after completing the contact tonight, we need to temporarily hide. Our recent radio communication is a little frequent. The alert team has discovered the abnormal movements of the US garrison. We now need to move to Base No. 2. Don't forget to erase all the traces before leaving." The major thought for a while and added.

That night, when Major Wintour's team passed the relevant information to the K4 submarine, the giant whale hidden deep in the ocean also began to perform its mission. They had to verify the accuracy of the information through personal observation. For example, just a few minutes ago, the K4 submarine had just received a telegram from Major Wintour. It is said that tomorrow, a fleet of transport ships will receive supplies from near Christmas Island, and the K4 submarine must determine the relevant situation based on intelligence and inference.

"First of all, according to the information, the other party's transport fleet will pass through an radius of 80 kilometers with Christmas Island as the center. So the entire range should be like this." The navigator first drew a circle on the picture.

"Secondly, according to our weather forecast, there will be wind and waves in the western waters of Christmas Island tomorrow, and this situation will be very unsuitable for replenishment, so we think they should replenish the supply in the east." The big shot next to it used a blue pencil to cut half of the circle away.

"Third, considering our radio direction finding distance and the visible distance of the US fleet. (It is to observe the distance of the US fleet's smoke column through the periscope.) We can cover the entire area by deploying at these points. The key is which of these points is what we should choose?" The navigator marked several nodes on the chart with a red pencil.

"The last problem is easy to solve. The major's team will send us a telegram in the early morning, and the content should be about the course of the US watering fleet and seaplanes. Based on this information, we should be able to determine the approximate location of the US fleet." The captain of the K4 submarine said at last.

The final result of the next day was acceptable for the British on the K4 submarine. Although it was finally discovered that the US fleet was at least 7 hours later than the scheduled time, and according to the results of the British observing the water after the adventure floated, the distance between the two sides may be more than 50 kilometers... But it is acceptable to be able to "see" the other party when it is almost impossible to decipher the other party's telegram. After all, if it is the Japanese Joint Fleet here, a fleet with a large number of reconnaissance aircraft and more systematic radio information processing capabilities will have almost no problems if it wants to discover such a fleet, and even after considering discovering the other party, it is OK to deploy in advance.

If you combine other information to explore the relevant information in depth, the staff of the United States and Britain will thus infer that the general route and schedule of the American transport fleet are possible. There is a saying that rabbits do not eat grass by their nests. Although one of the key nodes in the positioning of the British in the US transport fleet is Christmas Island, it does not mean that the Japanese fleet will attack the American fleet near Christmas Island. After all, judging from the major's telegram, the US Navy has been wary, and the major still wants to stay on the island for a longer time. Therefore, it is still necessary to clear the suspicion as much as possible.

Moreover, if you take action near the coast of Christmas Island, you must also be careful of the reconnaissance power of Christmas Island, such as the seaplanes and radio direction finding devices deployed on Christmas Island! The special frequency band small-power radio stations carried by the major may not be discovered immediately when sending reports through special methods (for example, if a telegram is split into several segments and sent in different frequency bands, the time for each piece of information is very short, which is difficult for the other party to capture.) However, frequent mobilization and contact at the large fleet level is difficult to hide. As long as one is leaked, the result will be very bad!
Chapter completed!