This lonely boundary monument established in the desert is more than one meter high and more than half a meter wide. It is carved in several languages ​​such as Mongolian and Xinjiang. Neither of them can understand it, but both of them can see the four largest Chinese characters in the center clearly: "Military forbidden zone!"

At the bottom, there is a line of tiny Chinese characters written in Chinese, most of which have been eroded by wind and sand, and only the last few words "xxx District People's Government" are still vaguely visible.

The two looked at each other and took a breath.

"What's your way to lead?" Old Wang next door turned his head and roared at Alexander.

Everyone knows what a military restricted area means. No matter what kind of adventure you are or not, you will be lost or not. Are you a college student? Even if you snipe with one shot, you will have no place to make sense.

Alexander also rushed up and squinted his eyes and observed for a while, and said casually, "This is a boundary marker decades ago, and it has now been abandoned. Lop Nur decades ago, because of nuclear tests and other issues, many places were listed as military forbidden zones. However, nuclear tests have been banned by various countries. Now most of them are carried out in laboratories using computer simulations, so the nuclear test site has also been closed. As time goes by, this military forbidden zone has been abandoned."

This explanation is difficult to satisfy. Alexander was sneaky along the way, and their routes were also twists and turns, as if he had been avoiding something. Could it be that Alexander had been taking them off to avoid military restricted areas?

This boundary marker looks like it has become one with the desert from a distance. If Lao Wang had not had the sharp eyes and was looking for hares everywhere, it would be really hard to find them.

Alexander didn't explain much about Zi Yang's suspicious eyes. Facts are better than words. He took out a handheld radiation monitor, "You see, the indexes above are normal. If it is a nuclear test restricted area, there should be a reflection, right?"

Lao Wang said, "I read very little, don't fool me. There are all English letters on it. How do I know this is a radiation detector? Maybe it is a blood sugar tester. The old men in rural areas use this thing."

Alexander patiently explained to him, "Look, there is a model r280 on it, which is a handheld storage β, γ, x multifunctional radioactive detector produced by German Coly. Even trace amounts of radioactive dust can be detected."

When Alexander and Lao Wang were doing popular science, Zi Yang also squinted his eyes and observed the surroundings, and found military targets such as snipers. He was not interested in Alexander's explanation. Military restricted areas do not necessarily represent nuclear testing grounds. Maybe there are other military facilities and uses?

After Alexander's patient resolving his doubts, the team embarked on a journey again. There was no way. They were scientists, and they were carrying food and water. It would be impossible not to follow them. The key is that this boundary mark that appeared inexplicably did not have an accurate division, and it belongs to the restricted area. Maybe when they saw the boundary mark, they had already crossed the military restricted area.

It's terrible to be uneducated. Now he has become a grasshopper led by Alexander. Alas, it's all because of insufficient scientific knowledge reserves. Zi Yang thought to himself.

After walking for a while, Zi Yang and Lao Wang finally realized that something was wrong. The compass they carried failed and the pointer was spinning around.

Lao Wang got angry with Alexander again, "I told you not to turn around. You must not listen. Now you are lost and your compass is no longer effective. What should I do?"

Alexander said calmly, "I haven't gotten lost, I'm walking well. I'm using the US military GPS satellite positioning system, with high accuracy and wide coverage." The implication is that you can't compare with those broken compass.

Lao Wang said disbelief, "You can receive signals in this ghost place? Besides, foreign scientists have also seen them on TV. They are basically poor people. How capable are you to receive signals from military satellites? Military satellites are for your home?"

After saying this, Lao Wang stared at Alexander tightly, and a cold light flashed in Xiao Slit's eyes, "You shouldn't be a military special sent by the US emperor!!"

Sometimes Alexander was really afraid that this slut would look so enigmatic. If you take care of him, you would be confused and ignore him, you would be detained by him.

In order to avoid Lao Wang's worries aggravate Zi Yang's worries, Alexander patiently explained to him: "The US military satellite is not completely confidential, and it has also opened up the authority for some civil and scientific research. Don't be nervous when you hear about military satellites. In fact, the US military's GPS satellite positioning system has been widely used worldwide. I, I am not very fluent in Chinese, Su Rui, please explain it to them."

Su Rui smiled and said, "GPS is the full name of globalpositioning system. It is a global positioning system built by the US military. However, most of the functions are used in the civilian field. There are 28 satellites in this system, distributed on orbital surfaces at 60 degrees between 6 intersections, about 20,000 kilometers away from the ground.

These satellites form a network with ground support systems, and broadcast information to global users every 1 to 3 seconds. Users anywhere on the earth can use the receiver to receive signals from at least 4 satellites at the same time.

After receiving the signal, the receiver can determine its position through the differential positioning principle. The current single-machine navigation accuracy can be about 10 meters. If it is comprehensively positioned, the accuracy can reach centimeter and millimeter levels. However, the accuracy open to the civilian field is about 10 meters, which is enough to cope with most situations."

Lao Wang looked like he suddenly realized, "I have always heard people say gps, gps, I thought it was just a small instrument, it turned out to be such a high-end thing - Oh, since this thing is so easy to use, can you make one for me? Don't be too expensive, just under 100 yuan."

Su Rui laughed, "You can ask Dr. Alexander to give you one."

Alexander generously stated on the spot that if this expedition can end successfully, I can give you this one in my hand. The implication is that you must be obedient.

Lao Wang took a big advantage, and all the negative emotions were wiped out at the moment, and even threw a charming look at Alexander.

Seeing Lao Wang so arrogant, Zi Yang was so angry, "Don't be so unpromising. When I go back, I'll find a compass, sextant, etc. for you online. With your IQ, it's enough to use it."

Lao Wang said, "Compass is a fortune teller, and a superstitious thing can be compared with Brother Shan's high-tech? Stop making trouble."
Chapter completed!