In the Bohai Sea, five lucky ships are separated by a few hundred meters from each other, looking at each other, sailing quietly in the rough seas.

On the 'Taishan', Tian Erniu basically didn't get seasick anymore, because he found a way to divert his attention, that is, to get busy.

Walking around the ship, constantly patrolling every situation, focusing all my attention on the work on the ship, I quickly got used to it.

"Uh~"

The situation of the silly bear is still not optimistic, and it even looks a little serious, but the silly bear seems to be stimulated by Tian Erniu's words, while seasickness and vomiting, he is constantly carrying heavy objects to constantly divert his attention, and he has ginger slices in his mouth, relying on the pungency of ginger to stimulate his cranial nerves and slow down the symptoms of seasickness.

There were people on the boat who were in a similar situation, some quickly adapted to the bumps on the boat, some were born without seasickness, and others were like silly bears, the situation was a bit serious, but they still kept going.

The sun gradually set in the west, and the afterglow of the setting sun turned the place between the sea and the sky into a fiery red world, which was so beautiful and spectacular that Tian Erniu was stunned.

"It's so beautiful!"

Tian Erniu couldn't help but sigh softly.

Soon, night fell, and the silver moon hung high in the sky, sprinkling a trace of cold moonlight, under the illumination of the moonlight, everything became even darker and hazy, only the lights from the other adjacent ships could make you feel a little safe.

Otherwise, in such an environment, people will have a kind of loneliness, as if they have been abandoned by the world.

Tian Erniu took out a pen, paper, compass, and sextant, the pen is a special black charcoal pen made by Liu Jin here, not an ink pen, it is always bumpy on the boat, it is naturally impossible to use an ink pen, and something similar to a pencil must be made to be more convenient for writing.

Needless to say, the compass has always been used to look at feng shui, and it is not difficult to make a qualified compass without any technical content.

The real nautical wonder is the sextant, the first in the history of the European invention in the 18th century, it is an optical instrument, can measure the angle between two distant targets - the most commonly used is to measure the celestial body and the sea (earth) horizon or the angle between the celestial body and the celestial body, measure the number of angles, and then according to the calendar to find the latitude of the direct point of the sun on the day, you can determine the latitude where the observer is located.

The sextant is the most important positioning and navigation instrument in the Age of Sail, and it was only in the 18th century that Europeans really invented it.

Of course, its principle is not complicated, it is very simple, the real difficulty is to make the colorless glass and telescope of the sextant, the colorless glass Europeans did not make until the sixteenth century, and the telescope was also invented in the seventeenth century.

Now that Liu Jin has made colorless glass, and understands the principles and methods of making telescopes, there is naturally no problem in making a sextant.

Tian Erniu skillfully placed the sextant on the horizontal position, pressed the clip, released the reading ruler, adjusted the North Star to the sea level in the field of view through the telescope above the sextant, and then began to continuously adjust the position of the reading ruler below, so that the position of the North Star was in the middle of the telescope's field of view.

Then he shook it repeatedly to make sure that Polaris was indeed in the middle of the field of vision, then wrote down the degree, and then flipped through the comparison table designed by Liu Jin, and began to keep holding a pen and calculating it on paper.

"Latitude 39 degrees 12 minutes ~ "

Soon, Tian Erniu calculated a result, and then carefully recalculated it several times again, and the difference in the data was very small, and he could basically determine his location.

He took out a simple globe, found the location of the Bohai Sea on the globe, and then opened the map and recorded today's location in his navigation diary.

"You're still a good erniu, you can understand such a complex thing."

Zhao Monkey has been following Tian Erniu's side, looking at Tian Erniu's busy appearance, he is very envious.

If a student of the Maritime Academy wants to become a captain, the first thing is to learn to use a sextant and calculate the dimensions according to the North Star, which requires a good brain and a good knowledge of mathematics.

Although Zhao Monkey is known as a monkey, he has never been able to learn, Tian Erniu is willing to learn with his heart, and he learned this thing, plus his performance in all other aspects, so he became the captain of the Taishan.

"This thing is actually very simple, as long as you learn it with your heart, you will be able to learn it quickly, come, I will teach you, the use of this sextant, you have learned, now the most important thing is the mathematical calculation, there are formulas in it, we can calculate the dimension of the ship according to the measured angle."

Tian Erniu smiled, and then began to teach Zhao Monkey hand in hand.

Life on the ship is actually very boring, because the ship is so big, all the space is arranged, and sleeping is also a very painful thing for the crew.

The sound of the sea water on the sea surface has been ringing non-stop, from time to time some people are seasick and vomiting, coupled with the continuous ups and downs of the waves, drifting, more than 100 people on the Taishan, most of them are difficult to sleep, can only keep tossing and turning in the bed, sometimes they really can't sleep, hurry to the deck to enjoy the cool night.

The next day, Tian Erniu was woken up by the screams of seagulls, got dressed and went outside, and found flocks of seagulls around the boat.

These seagulls fly in the middle of the sea, but also need a place to rest, and the ships sailing in the sea can knock on the mast that can provide them with a rest, so the presence of seagulls is always indispensable around the ship.

"The Bohai Sea is an inland sea, and it is very close to the coast, so it is normal to have seagulls."

Tian Erniu's mind remembered what Liu Jin said in class, this seagull can't be too far away from the land, so if you encounter a seagull, it means that there must be land around, which is also a way to find land, Tian Erniu firmly remembered this.

"Crunch~Crunch~"

Just as Tian Erniu looked at the seagulls and thought, the beams and wooden frames supporting the trawl made a series of ugly sounds, which made people immediately get goosebumps and feel a kind of tooth soreness when they heard it.

"Monkey, ring the bell immediately, it's time for our trawl to be closed, it seems that the profit should be quite large, otherwise it would not make such a sound."

When Tian Erniu heard this, he looked at the supporting beams showing a slight arc, and immediately said to Zhao Monkey.