Chapter 1414： Cross the north pole (2/2)

The bow of the boat comes out of the water first. When its drop-shaped bow is exposed, it seems like a huge whale emerges from the sea, and then the hull behind it.

”Open the hatch.” Otto said, climbing up the ladder.

In the past, the XXI submarine was only two thousand tons, but now the nuclear submarine has been enlarged to six thousand tons, greatly improving the space of the entire submarine.

There is plenty of space on the command tower, and Otto, wearing a military coat, can easily climb up.

Right now, it was at night, with all the starlight above the head, and the cold wind was blowing in, making people feel the biting cold, but the smell of this fresh air was still very exciting.

This is the first time I have seen the outside world since I set sail.

Following him, the chief mate on the boat also came out, took the starlight navigation device in his hand, pointed it at the familiar constellation, and prepared for the first calibration.

In the navigation of a submarine, the navigation and positioning of itself is also very important. In the previous submarine, this contradiction is not prominent, because most of the time the submarine sails on the surface. How the surface ship navigates, the submarine navigates.

However, when the snorkel was invented, submarines often sailed underwater. At this time, navigation began to have a doorway. As for now, nuclear submarines sail completely underwater and cannot see everything on the water. The navigation is more critical.

For this reason, the submarine designers took the inertial navigation equipment used in the missile.

The core of the inertial navigation system is the gyro, which is stable. Through the measurement of the relative position, the acceleration of the submarine can be known. Then, the speed can be obtained by integrating the acceleration once, and the range and the departure time can be obtained by the second integral. By comparing the position of the submarine, the navigation parameters such as the longitude, latitude, pitch and roll angle, speed, navigation distance and heading of the submarine can be calculated.

It's just that this thing is not very sensitive. Before the invention of the laser gyro, the error of the mechanical gyro would increase due to friction.

In this way, it is necessary to calibrate after a period of sailing.

Starlight navigation is the most common navigation method. It can be said that it has been used by navigators from the time of Columbus, and this is something every sailor must learn.

Now, the first officer carefully proofreads it three times. Finally, his face is helpless: ”Captain, after our voyage for more than half a month, our course has a great error~~Now, we We are not sailing in the direction of the Chukchi Sea. The one we are about to encounter is not Wrangel Island. Our course has deviated by a full 30 degrees. We are sailing in the direction of Novosibirsk.”

With inertial navigation systems, the longer the time, the greater the error. The previous trial time was not long enough, but now, it has accumulated a huge error!

For all this, Otto is mentally prepared.

”Okay, then let's adjust the course and sail eastward!” Otto said: ”Maintain high alert. The crew members will work in groups of two and let the wind go up there for two minutes each.”

Now, it is far from the coastline of the Soviets, and the Soviets have no anti-potential activity here. It is night again, and navigation should be safe.

After holding back for more than half a month, the sailors should also come up and let the wind go.

Otto's order almost made the sailors shout long live, they arranged in order inside the submarine, ready to go up and let the wind go.

”Turn on the sea search radar, and the sonar room is on alert.”