In the evening, Cao Cao and Lin Chuan had already discussed many plans regarding maritime trade.

Before Lin Chuan returned to the guest room, he saw Cao Chong and Jiang Wei waiting at the door of Lin Chuan's guest room.

After seeing Lin Chuan, the two of them said to him at the same time: "Teacher! ”

"What are you doing with me?"

Lin Chuan didn't know why Cao Chong and Jiang Wei were waiting for him here.

"Teacher, have you agreed on a time for maritime trade with King Wei?"

After Cao Chong and Jiang Wei saw the power of naval artillery, they were full of expectations for maritime trade.

"Where can it be so fast, a treasure ship alone is not enough for maritime trade.

After the inspection of the treasure ship at the Wujun shipyard is completed, the mass production of the treasure ship can be carried out at the shipyard in Yangzhou.

Moreover, the R&D base is still producing naval guns. ”

Lin Chuan looked at Cao Chong and Jiang Wei, who were looking forward to it, and explained to the two helplessly.

After Jiang Wei and Cao Chong listened to Lin Chuan's explanation, they immediately felt disappointed.

"You two don't need to be in a hurry, when the fleet is finished, there will always be a chance to go out to sea to have a look.

There are also naval guns for the fleet of the Great Wei, more out of the requirements of self-preservation, if we start to attack the outside world, it will run counter to the original maritime trade. ”

Lin Chuan knew that Cao Chong and Jiang Wei had the ambition to expand the territory for the Great Wei, so he explained to the two of them once again the fundamental reason for carrying out maritime trade.

The disappointment in Jiang Wei and Cao Chong's hearts at this time slowly disappeared after listening to the explanation of the teacher Lin Chuan.

"Alright, don't stand at the door, let's all come in and take a seat."

Then Lin Chuan beckoned Jiang Wei and Cao Chong to enter the guest room together.

After coming to the guest room, Lin Chuan took out a world map from his arms again.

Although it was not suitable to fight against the Kushan Empire, the Roman Empire, and the Sabbatarian Empire, the Great Wei could help them establish a unified empire with mineral resources such as Australia and the Americas, and without a strong unified empire.

Jiang Wei and Cao Chong saw a world map for the first time.

Although the two had heard Lin Chuan mention many times before that there were other empires besides Great Wei, their feelings were not very intuitive for both of them.

It wasn't until they saw the world map spread out by Lin Chuan on the table that Jiang Wei and Cao Chong had an intuitive understanding of the enormity of this world.

"It turns out that the area of the Roman Empire is no less than that of Great Wei!"

Cao Chong said in surprise when he saw the Roman Empire marked on the world map.

"Teacher, do we still need to trade with the Kushan Empire by sea?"

Jiang Wei asked, pointing to the Kushan Empire, which was adjacent to Great Wei.

When Lin Chuan heard this, he replied to Jiang Wei: "Of course you do, although the sea trade is much longer than the land trade in terms of time, but relying on the treasure ships with huge capacity, the Great Wei fleet can make a round trip to the Kushan Empire, and the goods that can be sold and the production raw materials brought back are hundreds of times more than land transportation!" ”

Jiang Wei only then understood that when transporting bulk goods, sea transportation has a huge advantage over land transportation.

"I see, I see."

Then Lin Chuan began to explain to Cao Chong and Jiang Wei the various benefits that maritime trade could bring to the further development of the Hanzhong Chamber of Commerce.

After Lin Chuan finished speaking, Cao Chong and Jiang Wei once again had a new understanding of the mood of opening up territory for the Great Wei.

Instead of taking more land, it is better to do business with the natives.

As long as Dawei can guarantee absolute superiority in terms of force, then the whole world can become the source of raw materials for Dawei's production!

At the same time, Yangzhou Wujun Shipyard.

Captain Yang led the craftsmen in the shipyard to carefully inspect the treasure ship that had completed the trial voyage from the inside to the outside, and found no problems.

Immediately afterwards, Yang Xiaowei told the good news to Cao Cao, the king of Wei.

Cao Cao was in a good mood after receiving Captain Yang's report.

While ordering the shipyard in Yangzhou to start building treasure ships at the same time, Cao Cao also gave a large reward to Captain Yang of the Wujun shipyard and all the shipyard craftsmen.

Captain Yang and the craftsmen of the Wujun Shipyard, who were rewarded, continued to devote themselves to the construction of the next treasure ship.

While building the treasure ship, Captain Yang also discovered a problem.

That is, the previous ships of the Great Wei Dynasty sailed near the coastline, but the treasure ships were large ships that could sail to the sea.

This involves a very important question, how to determine whether the route of the treasure ship is accurate in the vast sea?

The method of using the stars to determine the orientation at sea is still very flawed for treasure ships sailing in the ocean.

So Captain Yang explained the importance of this problem to Cao Cao.

After Cao Cao received the letter from Captain Yang again, he also had no clue how to make the treasure ship determine the route at sea.

"Mr. Lin can provide the drawings for the construction of the treasure ship, and I think there is a way to ensure that the treasure ship finds the right route at sea!"

Cao Cao immediately thought of Lin Chuan.

Of course, Lin Chuan would not disappoint Cao Cao, he had already prepared the compass, a navigation artifact.

The reason why he did not hand over the compass and the construction drawings of the treasure ship to Cao Cao was because Lin Chuan was dealing with the affairs of Yizhou Hanzhong Vocational Training College at the time and forgot about the compass.

"Mr. Lin, Captain Yang of Wujun in Yangzhou sent a letter to this king, saying that the treasure ship did not find any problems after the sea trial.

The king has now ordered the shipyards in Yangzhou to start building treasure ships at the same time.

However, Captain Yang raised a problem that needs to be solved, that is, how to ensure the accuracy of the route at sea.

I wonder if Mr. Lin has a solution to this problem? ”

In the side hall of the Wei Palace, Cao Cao said to Lin Chuan.

"Captain Yang has once again sent good news!"

After Lin Chuan heard Cao Cao finish speaking, he said happily.

"As for the problem raised by Captain Yang, I have prepared a solution!

The solution is the compass!

In the future, the Great Wei fleet can use the compass to determine the direction at sea, supplemented by astrology, and it is much easier to maintain the correct course. ”

Then Lin Chuan told Cao Cao his solution.

"Compass?"

Cao Cao asked Lin Chuan with curiosity, could there be a needle that could point to the south?

"Yes, the function of the compass is about the same as Sinan, but the effect is much better than Sinan.

And the positioning effect of the compass is also more accurate than Sinan! ”

Lin Chuan introduced the role of the compass to Cao Cao, and used Sinan to compare the role of the compass.

When Cao Cao heard Lin Chuan mention Sinan, he immediately understood what a compass was.

Mr. Lin explained, and the king understood what this compass was.

If it is more convenient and accurate than Zhi Sinan, it can indeed solve the problem of disorientation in sea navigation.

The manufacture of this compass will be handed over to the Hanzhong Chamber of Commerce! ”

"Okay, King Wei."

After Cao Cao assigned the task of making the compass to the Hanzhong Chamber of Commerce, he wrote to Captain Yang of the Wujun Shipyard in Yangzhou shortly thereafter.

After receiving Cao Cao's letter, Captain Yang learned that the Marquis of Hanzhong would provide the treasure fleet with a tool called a 'compass' for the navigation of the treasure fleet.