The map was drawn by the military surveying and mapping department, and the 101st team had a large-scale paper map of the area in its hand.

Trees that are in a particular position in the old age are marked with landmarks, also known as landmarks, and when you see them, you will know where they are on the map.

If you don't have a marker, you won't be able to figure out where you are, even if you have a map in hand.

Along the way, Zhao Yiyun relied on distinguishing the markers, but at this time, he walked for a long time, and when the markers should appear, he found that there was nothing.

Li Mu took out the map, and the map was naturally on him, the commander. quickly found the previous marker, and immediately confirmed Zhao Yiyun's judgment - Zhao Yiyun completely relied on memory to write down the direction and marker.

"That's right, this big tree should be in front of us. Li Mu said calmly, "I'm on the wrong track." ”

Zhao Yiyun frowned and shook his head, "No, the direction is right." He pointed to the compass in his hand.

After observing the surroundings, Li Mu raised his head and looked at the sky through the large gap between the trees. The sun had risen, and at last it had fallen, driving away the gloom of the whole night, and giving it some life. At least until the afternoon it will be a good day.

∽∽∽∽，m.←.co∧m

However, the good weather made Li Muyi unhappy - the extraordinarily large army aviation detachment could come out again, and those buzzing flies were absolutely depressing, when they did not belong to their own side.

"Look around, you can't go wrong with the map. Li Mu ordered in a low voice, then turned around and issued an order to the back to scatter and search for the marker.

The soldiers immediately dispersed, centering on the location where they were staying, and launched a search.

In the past, when he was picking people in the extraordinarily large area, Li Mu heard some veterans say that they were very large, and when they were engaged in wild survival or similar assessments, they would send out some specially made maps full of errors and omissions, which would add difficulties to the reference members.

However, Li Mu carefully looked at the map in his hand, it was already very broken, and the traces of frequent folding were cracked one by one, and there was no problem with the drawing unit and time. From this broken strength alone, Li Mu could conclude that there would be no problem with the map - it would not be possible to do it like this.

Standing there thinking about it, Li Mu suddenly thought of something, and hurriedly looked at the drawing time: 19 years. So I was disappointed, the time span is not very long, and judging from the marks on the map, the big tree that should have appeared must be at least thirty years old. A big tree like this is very difficult to disappear.

Take 10,000 steps back, even if it is cut down or collapsed naturally, there is at least a trace. However, Li Mu did not find any traces - traces can be easily found, and they will definitely not disappear without a trace anytime soon.

It's not a strange thing for such a big tree to be immortal for a hundred years.

What's more, along the way, there were no traces of human arrival in this deep mountain and old forest, so the possibility of being cut down can be ruled out.

"Nope. ”

"Nope. ”

The soldiers returned, shaking their heads.

The search range should not be too wide, and the error will generally not exceed 100 meters. For a large-scale map, this error is more unacceptable, so the search range is wide enough.

"Impossible. Shi Lei shook his head and said, "Such a big tree can't disappear out of thin air." ”

Du Xiaofan glanced at the map in Li Mu's hand, "Could it be that the map is wrong?" There have been a lot of such cheating things before. ”

Li Mu, who was expressionless and glanced around, slowly shook his head and spread out the map, "I've looked at it carefully, I can't do this by cheating." ”

"That's hell alive. Zhao Yiyun scratched his head, "There must be no mistake in the direction." ”

Li Mu's eyebrows jumped, his eyes fell on Zhao Yiyun, staring at him. Zhao Yiyun noticed Li Mu's suspicious gaze, and was thinking about something, when he suddenly found that Li Mu's gaze did not fall on his face, but on his hand.

Everyone also noticed Li Mu's gaze, and their eyes also fell on Zhao Yiyun's hand.

Zhao Yiyun looked down at his hand, holding the compass in his right hand, the corner of his mouth twitched, and Zhao Yiyun raised the compass.

"Why didn't I think of ......" Zhao Yiyun looked fiercely at the compass in his hand.

Li Mu: "This is the only explanation. ”

Shi Lei slapped his thigh, "Damn, there's something wrong with the compass!

Li Mu didn't pay attention to Shi Lei's hindsight, he took a step forward and knelt on one knee, Lin Yu stepped forward very tacitly and spread the raincoat on the wet ground, Li Mu spread the map up, and Zhao Yiyun had already come over there, and he knelt on one knee, and the compass was placed on the map.

Du Xiaofan also wanted to lean over to look, but when he saw Shi Lei turn around and be on guard against the outside, he held back and squatted down on this side to guard the outside - even though he didn't have a weapon in his hand!

"Lao Du, come and take a look. Li Mu called.

Lin Yu immediately gave up his position and went to Du Xiaofan's position, and Du Xiaofan squatted in Lin Yu's position.

Picking up a branch on the ground, Li Mu pointed to the map and began, "We passed by three landmarks, you see, here, here, here. With that, he gently drew a line on the map with a twig, connecting the three markers.

"Being able to find the third landmark, Ming Yi, has a deviation from the north arrow, but not much. Li Mu quickly mentally calculated, "The distance between the three landmarks adds up to two thousand seven hundred meters to three thousand meters ago. ”

"It's much easier to have a pencil. Li Mu complained, and then continued to draw on the map, saying, "According to the normal deviation of the map itself, refer to the route we took." Basically, it can be determined, well, that for every kilometer walked, the deviation is between eighty and one hundred and fifteen meters. Well, they're very hidden, it's hard to spot. The approximate deviation range is 4. 6 degrees to 8. between 6 degrees. ”

After Li Mu finished, he picked up the compass and weighed it a few times.

Zhao Yiyun and Du Xiaofan raised their heads and stared at Li Mu with incredible eyes, their jaws about to fall.

"How did you do it, computer!" Zhao Yiyun was surprised, absolutely not, Li Mu's hand, no one in the company knew, including him, could he not be surprised?

Exhaled, Du Xiaofan nodded, "That's right, you're right." Lao Li, your mental arithmetic speed is too fast. ”

"It's all middle school math knowledge. Li Mu lightly began to pack up his things, "I forgot the books I read when I turned my head, what is the difference between not reading and not reading." ”

Okay, slap in the face.

But Li Mu'er is not wrong - it is very simple mathematical common sense!

In return, Zhao Yiyun hurriedly calculated the distance of the deviation: "The deviation was once 17. About 4 meters, so our deviation range is ......"

Shi Lei snatched it unceremoniously: "Two thousand seven hundred meters are multiplied by 4." 6 degrees multiplied by 17. 4 meters and 8. 6 degrees multiplied by 17. 4, three kilometers multiplied by 4 respectively. 6 degrees multiplied by 17. 4 meters and 8. 6 degrees multiplied by 17. 4 meters. ”

"Wrong!" Zhao Yiyun trembled angrily, "I have to divide it by a thousand." ”

Li Mu shook his head speechlessly, too lazy to deal with them.

Du Xiaofan smiled and said, "The left and right deviations are between 16 meters and 404 meters and 40 meters and 449 meters, take the maximum value, let's search five hundred meters from left to right." ”

"Lao Du is reliable. ”

Li Mu threw down a sentence, turned around and walked to the right - it was completely possible to tell which way it was going, east or west by using the north arrow.

Undoubtedly, to the east.