When Zhou Yu heard that his voyage and island searching skills in recent years were learned from some barbarians who didn’t even have any words. Of course, Li Su and Zhuge Liang were shocked instantly.

Even Li Su was shocked even more than Zhuge Liang.

After all, Li Su's preconceived impression is bad. After all, as a person in later generations, his understanding of history is still biased and is easily disturbed by the strength of major civilizations in later generations, resulting in misjudgment.

So, if someone told Li Su that there were more advanced navigation technology than the Han people and could learn it from the Arabs or European Mediterranean merchants, Li Su would definitely not be so surprised.

Because the historical education he received in his previous life also gave him the impression that "the Mediterranean and the Persian Gulf Red Sea civilization is a maritime trade civilization", and the Han people are a farming civilization on the road, and it is no surprise that they have a unique skill that is more promising.

What are the native savages in Keyizhou?

It completely touched Li Su's knowledge blind spot.

Fortunately, the facts are right in front of you.

Zhou Yu did not have a telescope, only the old-fashioned sea ship that was visually observed, and its performance was far inferior to the lucky ship that Liu Bei's camp began to build five years ago.

With such simple hardware, they have actually found all the small islands around Yizhou without any omissions, which shows that their "software" is definitely outstanding.

Li Su had to accept it, and then decided to let go of his arrogance, learn humbly, and learn from others' strengths.

Zhou Yu did not dare to hide his personal information, and he recounted his exchanges with local barbarians over the past five years and his practical experiences learned one by one. Li Su and Zhuge Liang gradually understood the mystery.

Especially Li Su knew history, and after a little bit of it, he quickly remembered a possibility:

Zhou Yu told him that the nations that mastered this kind of ocean-going island search technology were mainly the descendants of the mountainous areas in the southeast of Yizhou, which was probably equivalent to some people from the mountain tribes in later generations. Moreover, after Zhou Yu's specific characteristics description, Li Su also remembered a noun in his mind:

The Southern Island people.

That's right, the Southern Islands people are the general term for the vast South Pacific islanders, from Polynesia, which occupied the vast South Pacific in later generations to Micronesia, Kiribati New Zealand,

Then to Indonesia, the Philippines, and even to the Maldives, Mauritius, Seychelles, Madagascar in the Indian Ocean. In the South Pacific and the South Indian Ocean, the archipelagos, which are often separated by one or two thousand kilometers are all the activities of the Southern Island people.

Their shipbuilding technology and productivity were still very backward and primitive, roughly equivalent to Maori in later Oceania.

However, because the South Pacific is calm all year round, there is no need for a ship with strong wave resistance. As long as you master the navigation technology and be good at using westerly winds and currents, as long as you have good navigation technology, you can raft and voyage for thousands of kilometers by relying on a few canoe and catamarans.

This is a typical combination of shipbuilding hardware technology that is very poor, but the navigation technology software is super strong.

In fact, it was not until the end of 16xx that the Americas were discovered and colonized for almost two hundred years that the Europeans had completely understood the navigation techniques of the indigenous people of the South Pacific, such as mastering the Southern Cross, the South Pacific astrological navigation methods.

Then it set off a wave of geographical discoveries among Europeans in Australia, New Zealand and other regions. Many Oceanian islands were found by Europeans in the 18th century.

Before this, European sailing civilizations' skills in finding islands in unfamiliar and vast waters were always behind those of the savages of the South Island nation.

Europeans are just good at building large ships and voyages, but not good at finding small lands in the ocean, so Columbus can only look for very huge continents like the American continent that are absolutely impossible to miss.

It can be seen that any nautical nation has unique points worth learning from.

A considerable number of the alpine people in the Yizhou area are indeed not from the East Asian continent, but from the South Island Islanders from the Pacific Ocean. Specifically, the South Islanders moved to the Philippines first and then to Yizhou.

Zhou Yu's in-depth development of Yizhou actually allowed the exchanges and integration of Han civilization and the South Tai Islanders to emerge in several dynasties, and by chance began to learn their strengths. The more they were, it was also a blessing for the Han Dynasty.

Otherwise, Li Su's own thinking alone, with his stereotype of ignoring the ability of barbaric nations, he might have missed it.

Now, the Han people have only been promoted by Li Suhong to improve shipbuilding technology, as well as the Marine and Website Surveying and Mapping Technology, and the hardware and theoretical system have become stronger, and then combined with the software upgrade in navigation practical experience, that is the complete picture!

Although Li Su will not be able to use it in the short term, it may be useful to send an expedition team to find the island in the future. Even if you go west, you will be savages and have no commercial or colonial value, and it is indeed worth finding new species.

As long as several expedition ships successfully bring back new crops, they will make any investment, although it is a bit far away.

...

For some time, civil officials such as Li Su and Zhuge Liang, and even military generals such as Taishi Ci Ganning, could not help but take advantage of their leisure time in government and military affairs to become obsessed with learning from the civilized navigation experience of Pacific Islanders.

I want to see how many specific experiences can be used in detail to form a nautical exercise scripture.

Zhou Yu did not hide his personal information, and analyzed in detail some of the islanders' experiences he had sorted out:

"The navigation techniques of the barbarians in the south of Yizhou are more than those of the Han people in the Central Plains. There are several main aspects. First, the barbarians in the south of the island are extremely accurate in the sea and can maintain a long-term navigation in one direction without deviation.

Moreover, they will also use the star orbit to accurately oriented at night and use fixed stars to lie at the zenith in different seasons to roughly determine the north and south level of the ship.

Secondly, they are good at finding islands within a hundred miles of error in the vast ocean using various methods of watching clouds, birds and fish. Even those barbarians can still see whether the island is a forest, grassland or a reef by looking at the background of the clouds..."

Zhou Yu summarized the directional navigation, fixed-latitude navigation and observing clouds, birds, fish and island search methods one by one.

The practical people like Gan Ning and Taishi Ci felt very happy when they heard it. Whenever they encountered some points, they would sigh in their hearts, "Why didn't I expect it?"

However, technical theories like Zhuge Liang have deeper reflections, not limited to who is stronger or weak, but only thinking about learning from the best and learning from the best and making up for the weaknesses.

Zhuge Liang pondered and compared for a long time and said, "It is not surprising that the method of direction is not surprising. The barbarians did not have Si Nan, and they could not use magnetic needles as compass, so they needed to watch the stars and determine the angle. Since ancient times, the Prime Minister improved the compass a few years ago, so it doesn't matter if there is no star sighting to set the angle.

However, these barbarian methods have given us some inspiration. Perhaps we can create some more accurate and easy-to-use equipment such as the compass we use today, such as adding a copper ring plate that can rotate coaxially on the periphery of the compass.

In this way, when the compass is pointed south to a certain angle in the clear night sky on the sea, the astrology outside the compass can be calibrated accordingly, and the two-pronged approaches can be used to complement each other. On the one hand, it can better train the naval sailors, and when the compass is unmagnetized, it can be supplemented by the angle measurement of the maneuver and latitude plates."

Taishi Ci Gan Ning heard the wisdom collision between Zhuge Liang and Zhou Yu and felt thoughtful. Among them, Gan Ning lacked experience in voyage south (who made him diarrhea as soon as he arrived in the tropics), and the foundation in this aspect was slightly worse, so I couldn't help asking:

"Since you just need to add a simple star chart outside the compass, why not just cast it with copper plates? What else should you 'coaxial rotation'? Wouldn't it be easier to break the sea bumps?"

Zhuge Liang rolled his eyes and explained in a caring tone: "You never watch stars when you look for enemies in the sea, right? When the star map is more than thousands of miles apart from north to south, the angle will change significantly, and the ups and downs of the four seasons are different. How can you use it if you die? Of course, you must cooperate with the four seasons and December to follow to use it."

Gan Ning immediately shut up. He was a thief in the Jiang thief for so many years and later became a pirate. However, because all the naval generals in Liu Bei's camp were equipped with compass, he really couldn't "look up at astronomy and summarize the astrological signs."

Zhuge Liang was a Lingtai Order and was in charge of the Taishi's celestial laws and regulations. Who could compare with Zhuge Liang in this regard in the Han Dynasty?

In fact, the method in Zhuge Liang's mind was even more complicated than what he said. He had already figured out how to do it, how to get several sets of outer circle star maps of star compass that match different latitudes, and then when sailing, the ship had to change an outer circle star map every few latitudes.

With the IQ of other people, Zhuge Liang was difficult to explain these things to them, so he didn't explain them in detail.

Zhuge Liang was slightly inspired by Zhou Yu and thought of doing this. To put it bluntly, it was also a simplification of ease of use, in order to quickly cultivate more pilot talents.

It’s like he turned the text description of the “Eight Formations” into the “Eight Formations Map”, and it’s convenient to train troops with a picture.

It doesn't mean that you can't play without this.

Zhou Yu had no idea how far the Han army's compass technology had developed. Now that he had surrendered to the court, he could only barely hear about it.

Then, Zhuge Liang explained how he used something similar to a sextant to determine the latitude, which was obviously more accurate than the local methods of the South Pacific islanders.

But Zhuge Liang also admitted that he could absorb and learn from some of the minor advantages of the barbarians to optimize the existing sextant and use some auxiliary peripherals to make the observation more intuitive.

After listening to Zhuge Liang's explanation, Zhou Yu realized that he was proud of several navigation techniques. It turned out that the other party had more theoretical and precise solutions.

It’s just that Zhuge Liang is modest, even so he is willing to learn from others’ strengths, and if he can, he will optimize.

Zhou Yu became more and more ashamed, so he had to try his best to tell him and share all the details he knew.

After he finished talking about the details of how to find the direction and the latitude, Zhuge Liang could barely discover some places that could be of substantial help to the Han Dynasty's navigation.

The so-called "substantive help" must at least be without your trick. Some things are completely impossible to accomplish, or the difficulty and cost increase greatly.

It turned out that Zhou Yu mentioned a technique called "Yizhou barbarians use bonfire connection method to indicate the course of target islands."

This method is not very intuitive. It is that those barbarians will find a plateau platform on the high mountains near the port, set up a bonfire, and then a hundred steps away from the bonfire, surrounded by a large circle of firewood.

Also mark the relative direction angle between the island and the surrounding islands. When the fleet set sail, it selected its destination in advance. People on the shore lit the main bonfire and the small bonfires in the corresponding direction of the route.

Those who set sail at night at sea should just look back at the main fire and the small fire connected to a straight line, then they will determine a straight line at two points and aim at the direction of the island they are going to go to.

Of course, this method is useless when you need to go against the wind and grab the wind. It can only be used when you drive the boat in one direction while you are on the wind. And if you have a compass, it is not very necessary.

However, in a busy port where the ship enters and leaves the ship, it is convenient for route management to prevent small boats from rushing and colliding. Moreover, if there are many ships in a busy port, not every ship has a compass. At present, civilian ships on the Han Dynasty do not have compass, and they are all the official fleets of the court, or families like Mi Zhu, who have mastered the compass.

In any case, the experience provided by Zhou Yu is beneficial to port construction and management, and can improve navigation order and efficiency.

If Li Su wants to build a new national hub-level large seaport in the future and build a lighthouse outside the port, he can consider upgrading the Polynesian bonfire technique, combining the engineering construction capabilities of Dahan, creating a small wonder and creating a two-circle concentric lighthouse.

For example, a lighthouse was erected on the island of the Yangtze River Estuary. During construction, the outer ring tower should be marked as "How many degrees to go to Danluo Island, How many degrees to go to Tsuma Island, How many degrees to go to Xiematai, How many degrees to Bear Estimated Heading, How many degrees to Liuqiu's Heading, How many degrees to Yizhou"

It is obvious that when there is a fleet that will set off, click the small bonfire at the corresponding angle and connect it to the main bonfire. From the estuary of the Yangtze River, within a range of 1,000 to 1,500 miles, you can just fly directly from Sanhan to Yizhou in the north, and from Yizhou in the south, and from the east to the 180-degree fan island chain in Japan.

...

All the barbarian experiences of fixed courses and fixed latitudes were introduced. In the end, there was only one experience in building a port lighthouse. The others were just minor repairs, and Zhuge Liang was already more specialized than him.

This result made Zhou Yu bet on the secret method of "finding islands in the ocean".

Because he had already talked a lot that day and it was too late, Zhou Yu went back to rest for a few days, prepared, and fully organized and summarized it. He wanted to regain his face next time.

A few days later, a group of people continued to hold a meeting to discuss, and Zhou Yu finally took out his proud method:

“…The way for the barbarians in Yizhou to view the clouds from the ocean to find islands is mainly divided into two situations.

One is that when there are sunny days, when the weather is low and there are clouds, it will rise and condense into the characteristics of rain clouds when it arrives on land, and look out for rain clouds in the distant sea. Once you see cloudless everywhere and clouds somewhere, there are mostly islands below.

In this way, if you look at the land with your eyes, you may have to be close to thirty or forty miles away from the island, and the clouds are extremely high and can be seen a hundred miles away. If it is a volcanic island, the clouds can be seen as far as three hundred miles away, and the chance of missing the island in the vast ocean will be greatly reduced.

Secondly, if it is cloudy and there are cloudy and rainy everywhere in the sky, it is difficult to distinguish which island clouds are and which sea clouds are. Which barbarians can also visually calculate the speed of clouds floating to judge.

They have summarized for thousands of years that clouds flutter faster when encountering wind on the sea and slower when floating on the island, because the wind will be blocked by land, and it will change from being blown horizontally to partial up and down turbulence.

Therefore, in the cloudy sky, find the flaws of floating clouds that are sometimes slow and sometimes fast. Wherever slow and fast occurs, there are mostly large islands below. In this way, just like the previous step, you can expand the "ship to be close to the island forty miles before you can miss the island" to "as long as the ship is close to the island within two or three hundred miles of the island, you can miss the island," and the search accuracy has greatly increased."

This experience is probably hard to explain if you just want to find a Polynesian navigator. This is also a summary of Zhou Yu’s experience of comparing with the masters of maritime instinct instinct in the South Island over the past few years.

On Li Su's side, the civil and military personnel involved in navigation were organized to discuss with Zhou Yu. It has been a while since they finally came up with something that could save everyone.

After all, Zhuge Liang can watch stars, but he is not good at watching Haiyun.

Zhuge Liang only looked at the clouds and knew whether the weather would be sunny or rainy, and whether there would be strong winds. The specific experiences of "the movement trajectory of clouds above sea and land" have all touched the blind spots of knowledge for Zhuge Liang.

"I didn't expect that Zhou Yu is also a navy genius. After so many days of training, he actually has an experience that I don't understand at all... It seems that we cannot underestimate any barbarians. Among the barbarians, there are also mysterious secret techniques that we Han people do not understand at all."
To be continued...