On the west side of the island, there is a small village, in the corner of the village, with a house.

The walls of the room are white, with yellow double-open wooden doors, and under the eaves is a table with several chairs next to it.

At the back of the house, there is a large orange orchard, which is covered with white flowers and looks extremely beautiful against the narrow leaves.

The room facing the orange grove was open to a window, and behind the window was a desk, and in the corner of the desk, there were thick books, and the names of the books were written on the covers: "Encyclopedia of the Ocean", "Waves and Currents", "Encyclopedia of Marine Life", "Atlas of Tropical Climate and Cyclones of the East China Sea", "Mapping", "Meteorological Observations"

These books cover the ocean, biology, ocean currents, climate, graphics, and meteorology, and are both popular and professional.

Most of the books are a bit old,

And the owner of these books is only a little girl of eight or nine years old.

At this time, she was sitting at her desk, drawing something on a large drawing, holding a pen and a ruler.

"It's done."

The little girl put her pen aside and looked at the nautical chart on the paper, on which two islands and a large ocean were drawn, in addition to the marked longitude and latitude, there were contour lines on the island, contour lines in the ocean area, as well as shipping routes and substrate markers, and the water depth of the island's harbor.

"Nami, are you drawing charts again?"

Behind Nami, a young girl with blue hair stood, her eyes fixed on the charts on the table.

"Nokigao?"

Nami was startled by the sudden sound, she looked at the other party and said with a smile, "Well, I just drew a nautical chart. ”

"That's amazing."

Nuo Qigao looked at the charts, "I can't even read the charts for me, let alone draw them." ”

"It's just a copy of the nautical charts on the map."

Nami looked at the charts and said with a smile, "After all, it takes a lot of data to draw a nautical chart of an area. In addition to bearing, latitude and longitude, there are changes in currents and currents, which are used to map routes and anchorages. The depth of the ocean, the identification of seafloor topography, and the identification of seafloor sediments. In addition, the nature of the coast, the depth and characteristics of the port, navigational signs, such as what features can be used to distinguish the island, navigational equipment, and the location of lighthouses. These need to be measured in the field. So I just mastered the basics of charting. ”

"What a nuisance." Nokigao rubbed her hair, looked at Nami and asked, "Field measurements?" Then you need to go to sea?

Nami nodded and said with a smile, "That's right, drawing a new nautical chart requires field measurements, otherwise, the error and actual deviation will be too great." For example, on the island where we live, the chart is so wrong that I found at least three. ”

"Huh?"

Noki held her chin high, looked at Nami and asked, "So you plan to leave Cocoa West Village in the future?" ”

"My dream is to travel all over the world and map the whole world." Nami said seriously.

"All over the world?" Nuoqigao's eyes widened, "Are you going to a dangerous place?" ”

"Of course."

Nami nodded heavily, and said, "But I don't have enough knowledge, so I'm going to learn about water level observation and navigation." After learning about water level observations, I was able to start by charting the sea around our island. ”

"Oh."

When Nokigao heard this, he didn't have much interest, and then asked, "Nami, do you want to go out and play?" ”

"No, I still have to read."

Nami picked up a book, spread it out in front of her, and read it carefully.

"It's boring."

Notch stretched and climbed onto the cot next to her.

。。。

In the bay south of the island, summer and autumn are looking for prey in the sea.

It's been nearly two and a half months since I came to this sea, and it's May.

After more than two months of growth, Xia and Autumn grew from 18 meters to 22 meters, and weighed nearly 70 tons.

In more than two months, he has grown four meters and weighed twenty tons, which is much slower than the previous growth rate.

This slowdown, Xia Qiu made two guesses.

The first guess is that he has entered the next stage of growth, and the growth rate has slowed down.

For example, it only takes eight months for a blue whale to grow from seven to fifteen meters at birth, while it takes two years to grow from fifteen meters to more than twenty meters, and at least two and a half to three years old.

To reach adulthood, the body length is more than 25 meters, and it is almost eight to ten years old.

You may have passed the juvenile stage and entered the sub-adult stage, so your growth rate slowed down.

But his own growth is not the same as the creatures in the One Piece world, and there should be no restrictions on the growth cycle.

The second guess is the change in its own strength.

He left the village of Nar and ate one colonel and fourteen pirates, several times in number and strength.

This time the enhancement is huge.

You must know that before leaving Nar Village, before you have digested Colonel Lido, you can resist the power of a thirty-meter huge sea fish with your eighteen-meter body.

And after eating Colonel Lido and the pirates, his strength increased again, and he became stronger, far more than a fish of the same size.

If your body is strong, the energy consumed will be more and more.

For example, a pound of muscle at rest burns 6 calories, while fat can only burn 2 calories.

After I became stronger, I was consuming a lot of energy all the time.

Originally, the energy involved in oneself far exceeded one's own consumption, and after making up for the consumption, there was a large amount of energy to supply one's own growth and evolution.

But now, the energy consumption is too large, and the evolutionary energy I get from the body of the sea fish is more used for consumption.

The remaining evolutionary energy slowed down his growth rate greatly.

Of these two speculations, Xia Qiu leans towards the second.

This one is better for yourself.

What I want is not to blindly become bigger, that will only become a target.

Even the island eaters who can devour the island were defeated by Dongli and Brocky practicing a move to dominate the country.

And the huge sea kings without the wind belt are just an appetizer for the lieutenant general.

I want great power.

Xia Qiu thought as he swam away while releasing ultrasound waves and using echolocation to locate other sea creatures.

Sonar system.

After eating dolphins, he successfully evolved a sonar system, including a sounder, a receiver, and an analyzer.

But at that time, it was relatively weak, and the sonar range and sensitivity were not comparable to my own perception.

Later, Xia and Autumn encountered two more pods of dolphins, and after eating them, the current sonar system can be used.

Within 300 meters, you can tell the distance, size, and shape of the fish.

At the same time, summer and autumn can also actively receive high-frequency frequencies to discover different organisms in the water.

Although it is not as good as a dolphin, it is already a very precious ability.

Over there.

To the northwest, it is 200 to 230 meters away from itself, and its body length is about seven meters.

Xia Qiu caught a signal and quickly swam into the distance.