These navigation devices do not cover the Japanese mainland and cannot accurately navigate selected targets. As a matter of fact, the Anti-Japanese Union carried out bombing against Japan and carried out precise navigation, and it was only after the arrival of radio navigation equipment aided by the United States and Britain and the adoption of American and British navigation technology that the real full-course accurate radio navigation was realized.

But even this kind of navigation equipment is relatively rudimentary, and it cannot cover the Japanese mainland, and can only be said to indicate the direction of bombing. Compared with the Japanese Navy's habitual use of sextant navigation, at least there has been a considerable improvement in technology. The requirements for pilots are not so harsh.

And in Yang Zhen's view, these navigation devices are only a preliminary solution. Because before the arrival of the US and British strategic bombers, the bombing of the Anti-Japanese Union against Japan was limited by the performance and number of bombers, which was symbolic at best. As for real all-out strategic bombing, at least for now, it's better to fuck it.

Although the only range used by the Anti-Japanese Union is sufficient, the Il-4 bomber, which has poor firepower for self-defense and a small bomb load in long-range flight, bombs the Japanese mainland at most means and means and expresses an attitude to the United States and Britain. At this point, the equipment is rudimentary, but it's better than nothing.

Moreover, in addition to symbolism, it is more of a military training nature, as well as the study and solution of some problems that may arise in some technical aspects. In order to prepare for the next stage, a real strategic air attack on the Japanese mainland. Sharpening knives and not chopping wood, this is Yang Zhen's main purpose.

Most of the flight range, especially long-haul flights across the sea, the navigation problem is solved. As for the remaining 200 kilometers, for the group of pilots who participated in the air raids, it was only necessary for them to fly straight to the east to reach Japan. The possibility of another Trek is already very small.

If he can still get lost in this way, then Yang Zhen should really consider the training level of his aviation pilots. As for the two airborne equipment, they can receive radio broadcast signals from Japan, and can be used as aircraft for navigating deep into Japan's territory. For reasons of secrecy, Yang Zhen resolutely did not allow these two planes to enter the territory of the Japanese mainland.

The radio signal navigation and capture equipment on both planes was rudimentary, but it was absent from the Japanese army and navy. If there is a problem with these two planes, crashes or is shot down in Japan, and these devices fall into the hands of the Japanese, then it is the Anti-United Nations themselves who are unlucky.

The Japanese army and navy can completely rely on the local industrial capacity to imitate and even improve the performance of these equipment, and take off from the mainland to bomb the rear base areas and industrial areas of the Anti-Japanese Union. Although the Japanese Navy's Type 96 bombers are already somewhat backward in performance, they have a super-large range of 4,000 kilometers and have absolutely no problem in bombing the Anti-Japanese Union.

Therefore, in order to avoid any accidents on these two planes and to prevent the on-board equipment on these two planes from falling into the hands of the Japanese army, Yang Zhen still resolutely demanded that the air force must not enter the Japanese mainland. It was even strictly stipulated that after sending the bomber group to the signal junction, it was necessary to return immediately.

Although to put it bluntly, this device is the use of high-power short-wave radio signals, in the same frequency band, the same power, the principle of mutual interference after the signal crossing. And that so-called signal intersection is the area where mutual interference is most intense.

As long as you find this area, you have found the intersection of signals. Such equipment and principles are actually not complicated. However, the development of ideas and equipment took painstaking efforts. No matter how imperfect this equipment is, it must not fall into the hands of the Japanese.

So even the equipment on these two planes can use the signals broadcast by the Japanese radio as a follow-up navigation. But Yang Zhen still insisted on these two planes and was absolutely not allowed to go deep into the Japanese mainland. In the event of a breakdown of an aircraft, or an interception by a Japanese aircraft off the coast of Japan, it is better for the equipment to fall into the sea than into the hands of the Japanese.

At the same time, the air force has also preliminarily solved the problem of long-distance formation flights, the method of identifying the course of the Japanese Navy's long-distance cross-sea flight using the Japanese Navy's long-distance cross-sea flight, and a series of other technical problems. The Aviation Operations Department also put forward several bombing plans in accordance with Yang Zhen's request.

It was precisely because of Yang Zhen's request that the bomber group of the Anti-United Nations could only rely on aerial maps and ground references to fly when they penetrated deep into the Japanese mainland. However, after solving the basic problem of sea flight navigation, the remaining problems are not a problem, and can be completely solved by training.

After solving the most difficult technical problems, the air force also put forward three sets of bombing plans in order to ensure the conduct of the bombing of Japan. First, the bomber groups took off from Mudanjiang and Linkou airfields respectively and converged over Dongning. Flying over the Primorsky Territory of the Soviet Union, flying over the Sea of Japan and bombing the Japanese Nakajima Aircraft Company in Ojima Town, Gunma Prefecture, Honshu.

Nakajima Aircraft Company, is the largest manufacturer of combat aircraft for the Japanese Army. Using this area as a major bombing target and destroying it would greatly reduce the Japanese Army's aircraft production and manufacturing capacity. When Yang Zhen issued an order to study the bombing of Japan, the air force took this place as the preferred bombing target.

The second option is to take off from Dongning and Ning'an respectively, meet over Hunchun, and enter the Sea of Japan via the Tumen estuary. The course then turned southeast and headed straight for Hachiman in Fukuoka Prefecture, Kitakyushu, at the southern tip of Japan. It is home to the largest steel mill in mainland Japan, the Yawata Iron Works. If it were destroyed, it would have a fatal effect on Japan's military-industrial production.

Moreover, in Fukuoka Prefecture, there is not only the Yawata Iron Works, Japan's largest steel production base, but also the Ogura Army Arsenal, one of the large arsenals of the Japanese Army. The entire territory of Kitakyushu is densely populated with various arsenals. The decision was made after careful consideration of the choice of this place as the target for the Air Force.

The third plan is more risky, that is, to take off from Wang Qing and Tumen, use the cover of P-40 fighters to rendezvous over the Hamgyong Mountains in northern Korea, and after arriving on the Japanese mainland, fly over the entire Honshu Island and go straight to Osaka, destroying the Osaka Artillery Factory, the largest gun manufacturing factory of the Japanese Army in Osaka.

The three options of the air force, the routes and the goals are all different, but the goals are all the important places of military production of the Japanese Army. In addition to considering that the main opponent of the current anti-union is the Japanese Army, it is also because of Yang Zhen's order. In Yang Zhen's words, we neither have a navy nor are we close to the sea, and the main enemy is the Japanese Army.

Since it was determined to bomb the Japanese mainland, the main goal was to destroy the combat strength of the Japanese army. Whether it is the shipyards of the Japanese Navy, the naval bases, or the production capacity of the military industry, except for the naval aviation, which has a little bit to do with it, the rest have nothing to do with the Anti-Japanese Federation. If you want to blow up their army arsenal, the navy should let the United States and Britain have a headache.

For the three scenarios, the aviation forces are clearly inclined to the first. Because the current base area of the Anti-Japanese Union is not close to the Sea of Japan. The routes available to the planes bombing the Japanese and anti-coalition planes were either over the Soviet Union, or they could only choose the Tumen estuary or the Korean Peninsula.

Compared to the last two routes, which are within the operational range of the Korean and Japanese naval and army aviation, and have close ground and air surveillance posts. The option of passing through the Primorsky Territory of the USSR was clearly more attractive to the Aviation. For no other reason, choosing this route would have avoided the interception of the Japanese army and naval aviation stationed on the Korean Peninsula.

At the same time, it can also avoid the air surveillance posts of the Japanese army and navy on the Korean peninsula, as well as the surveillance ships of the Japanese navy off the coast of Korea. This not only reduces the possibility of interception, but also ensures the secrecy of air strikes. Choosing the first option can minimize the battle damage rate of air strikes.

It's just that what the aviation didn't expect was that the first plan was first vetoed by Yang Zhen. Yang Zhen also wanted to enter the Sea of Japan through the Primorsky Territory of the Soviet Union, so that he could achieve strict secrecy and achieve the greatest suddenness of the battle. At the same time, it is also the closest route from Jiamusi, the most well-established aviation base of the Anti-Japanese Federation, to the mainland of Japan.

However, the Soviets had already taken this into account and repeatedly warned the Anti-United Nations when they were building up an air force for the Anti-Japanese Union, especially when they sold the Il-4 bombers that could reach the Japanese mainland with a flight range. Once the bombers of the Anti-Union flew across the Ussuri River, whatever their intentions, the Soviets would see it as an invasion and would not hesitate to shoot them down.

For the Soviets, who tried their best to avoid fighting on two fronts, they would never allow the planes of the Anti-United Nations to bomb the Japanese mainland through their own territory. And this route is also a route for the Anti-Japanese Federation to conduct secret reconnaissance against Japan. When conducting research and development of navigation technology, the technical aircraft of the Anti-United Nations have used this route to enter and exit many times.

Yang Zhen vetoed the choice of the air force, in addition to not wanting to be too stiff with the Soviet side at this time, the most fundamental thing is that Yang Zhen still does not want this secret route to be exposed. This is because once it is revealed that the planes carrying out secret technical reconnaissance missions of the Anti-United Nations will no longer be able to enter and exit the Sea of Japan through the territory of the Soviet Union.

The Soviet Army in the Far East, although most of it was transferred. But in the Far East, an air defense force, dominated by naval aviation of the Pacific Fleet, was retained. Although they are all old I-15 and 16 fighters, the number of new planes is very small.

But these old fighters are still a great threat to the Il-4 bombers, which have very poor self-defense capabilities. Unless the Anti-United Nations sent fighter escorts to engage in air combat with Soviet interceptor planes, they did not hesitate to take the risk of openly turning their faces and forcibly borrowing the way. All the planes of the Anti-Japanese Union could not enter the Sea of Japan through the territory of the Soviet Union.

Because in terms of the character of the Soviets, since they have repeatedly warned them, they will not hesitate to shoot down all the anti-United Nations planes passing through the Soviet Union. The Soviets, who took their own interests very seriously, would never allow the actions of the Anti-United Nations to bring the slightest risk to themselves.

The most important thing is to use the shape of a single machine, or to quietly pass through the sparsely populated Primorsky Territory of the Soviet Union in small clusters, as long as it is well planned, there is no big problem. However, the large fleet cannot be smuggled in any way. As soon as you enter the territory of the USSR, you simply cannot avoid detection.

Moreover, in addition to aerial reconnaissance of Japan, this route also undertook other secret missions, which could not be exposed under any circumstances. Therefore, after careful consideration, Yang Zhen chose the next two routes for the air force. The route through the Primorsky Territory of the Soviet Union was vetoed by Yang Zhen.

However, considering the air surveillance of the Japanese army and navy on the Korean Peninsula and the possible interception, Yang Zhen still chose the Tumen River Estuary as the route into the Sea of Japan. Although this route may also be discovered by the Japanese because it is too close to the northern part of the Korean Peninsula.

But on the other side of the Tumen estuary, part of the area north of Najin in the northern part of the Korean Peninsula. After the previous stage of the battle, it was actually under the actual control of the Anti-Japanese Union. Even if it is through the mouth of the Tumen River, the probability of being discovered by the Japanese army is no greater than that of borrowing the Soviet Union to get there. It's just that there are Japanese blockade ships on the Tumen River estuary, which is relatively slightly more dangerous.