After participating in the power test of the naval gun, Cao Cao, Lin Chuan and others returned to the palace of King Wei again.

"Mr. Lin, now that the treasure ship has been successfully built, the power of the ship's guns is obvious to all.

The next step was to build treasure ships and naval guns, and the maritime trade would soon begin. ”

Cao Cao was full of expectations for the development of maritime trade.

In Lin Chuan's description of maritime trade, what Cao Cao longed for the most was not the fact that he could obtain various production raw materials through maritime trade, but the grand occasion of all countries coming to court.

This will be an unprecedented achievement achieved by the Great Wei.

Cao Cao thought that with the merits of these countries, he could be compared with the Qin Emperor and Han Wu.

"Yes, King Wei. The shipyard in Yangzhou has thoroughly inspected the treasure ships after the trial voyage at the Wujun shipyard, and if no serious problems are found, they can be built in batches.

I believe that in order to start trading at sea, it will take at least a fleet of five treasure ships to ensure that we can respond to all kinds of contingencies at sea and when we land. ”

Lin Chuan also told Cao Cao his suggestion, and Cao Cao nodded in agreement when he heard this.

Then Lin Chuan explained the arrangements of the Hanzhong Chamber of Commerce in Yangzhou to Cao Cao.

"Very well, after the renovation of the Hanzhong Vocational Training College and water conservancy facilities was completed, it was also the time when the maritime trade began."

Cao Cao has always been very satisfied with Lin Chuan's thoughtful arrangement.

Then Cao Cao asked Lin Chuan again: "Mr. Lin, this king sent the master in Taixue to sort out the nautical charts of the previous dynasty so that they can be used as nautical charts for maritime trade in the future.

It's just that because of the war, the existing charts are not very detailed.

I wonder if Mr. Lin can solve the problem of nautical charts? ”

Cao Cao, who was no longer worried about the fleet going to sea, was now troubled by the charts.

In the vast sea, if there is no chart to guide the course, then how many treasure ships sail into the depths of the sea are basically the end of no return.

Lin Chuan was not interested in the charts left by the Great Han.

During the Qin and Han dynasties, people basically sailed along the coastline.

There are three main reasons for this.

One is the design and structure of sea ships in the Qin and Han dynasties, and there is no way to cope with the wind and waves at sea for a long time.

The second is that due to the shipbuilding technology at that time, the ships were only one-tenth of the treasure ships, and could not store enough food and fresh water, so sailing near the coastline was also to facilitate the replenishment of fresh water and food.

The third is that the navigation technology at that time was not advanced enough, relying on the stars to navigate, in the face of continuous rainy weather, ships can easily lose their way and die in the sea.

It was for these three main reasons that Lin Chuan believed that the previous charts did not play a very important role in the maritime trade that the Great Wei was about to embark on.

"King Wei, please don't worry about the sea charts.

The ability of treasure ships to sail above the seas has surpassed that of all existing ships.

Therefore, even if he had the detailed charts before, the significance was not particularly important to the Great Wei Sailor who owned the treasure ship. ”

Lin Chuan first asked Cao Cao not to worry about the sea charts, and then Lin Chuan took out a drawing from his arms.

"Regarding the detailed nautical charts and the current locations of the countries in the world, I have made a more detailed drawing here, please take a look at it, King Wei."

Cao Cao saw that Lin Chuan first said that he didn't need to worry about the chart, and then took out a drawing from his arms and handed it to himself, and couldn't help but open the drawing immediately to check it.

"Mr. Lin, this is ......"

Cao Cao looked at the world map that Lin Chuan handed over to him, and he was so excited that he was speechless for a while.

"King Wei, this is the 'world map', including all the continents and seas in the entire world!"

"World Map?!"

After hearing Lin Chuan's answer, Cao Cao looked at the world map in front of him and couldn't help but exclaim.

In the whole world, not only is it not the central location, but the area does not seem to be the largest.

And according to the record on this world map, the whole world turned out to be a huge ball?!

Now people's understanding of the world is still in the stage of the round sky, and the world map that Lin Chuan took out brought Cao Cao a great impact.

"King Wei, now in this world, in addition to the Great Wei, the Kushan Empire, the Sabbath Empire and the Roman Empire, you should all know it."

Because of the trade of the land Silk Road and the maritime silk/silk road, the empire of Eurasia during the Han Dynasty already had some understanding.

Therefore, Lin Chuan did not focus on these three empires to Cao Cao, but introduced Australia and the American continent.

At that time, although there were many aborigines in Australia and the American continent, there was no empire-like ruling group.

"King Wei, so we can start maritime trade with the Roman Empire while sending a fleet to Australia in the Americas to mine various mineral resources."

After Lin Chuan briefly introduced the situation in the Americas and Australia to Cao Cao, he concluded.

"Hahaha, what Mr. Lin said is good.

However, this king feels that with the current military strength of Great Wei, it is not impossible to capture other empires. ”

For Cao Cao, the allure of land was too great.

Since the subjugation of Xianbei, the territory of Great Wei has basically reached the limit of what it can expand now.

The only factors that constrained the Wei from further expanding their territory were the population and the land suitable for cultivation.

The north has been completely developed for the Great Wei, but the south can rely on the advantages of natural and excellent ports to carry out rapid development after maritime trade.

"Although the military strength of the Great Wei is now second to none in the entire world, the current population of the Great Wei is not enough to conquer other empires for further rule.

Rather than using warfare to gain wealth and produce raw materials from other empires, I think it would be better to rely on the treasure fleet and the Hanzhong Chamber of Commerce. ”

Lin Chuan saw that Cao Cao still had a great interest in the expansion of the territory of Great Wei, and that Great Wei did have this strength now, so Lin Chuan felt the need to persuade Cao Cao.

Conquering the Kushan Empire or the Sabbath Empire and collecting raw materials for the production of Great Wei did not do much good.

On the contrary, trading with the upper echelons of the Kushan Empire, the Anxi Empire, and the Roman Empire made it more convenient for the Hanzhong Chamber of Commerce to purchase various production materials.

And Lin Chuan thought that some armor and Shenwei cannons could be appropriately sold to the other three empires to strengthen their rule over their respective empires.

However, Lin Chuan now felt that there was no need to mention this idea to Cao Cao.

After the Hanzhong Chamber of Commerce obtained a large amount of raw materials for production through maritime trade, it is believed that Cao Cao and the court of Great Wei will discover the key points on their own.

"Hahaha, this king just mentioned it casually, Mr. Lin doesn't have to take it seriously."

Cao Cao saw that Lin Chuan persuaded him not to rush to use troops abroad, so he explained to Lin Chuan with a smile.